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Medical Dictionary


drifts (drifts)
Slow ocular movements of greater amplitude than flicks, occurring during ocular fixation. SYN: drift movements.

1. To make a hole in bone or other hard substance. 2. An instrument for making or enlarging a hole in bone or in a tooth. [Middle Dutch drillen, to bore] bur d. bur. dental d. a rotary power-driven instrument into which cutting points may be inserted. SEE ALSO: handpiece.

A drilling away; scooping out. cochlear d. implantation of electrodes in a cochlea in which the lumen of the scala tympani has been obliterated by the deposition of new bone due to the inflammatory process in labyrinthitis; the cochlear wall and new bone are drilled away so that the electrodes can be placed close to the remaining neurons of the auditory division of the 8th cranial nerve.

Philip, U.S. industrial hygienist, 1893–1972. See D. respirator.

1. To flow a drop at a time. 2. A flowing in drops. alkaline milk d. a variable mixture of sodium bicarbonate in whole milk dripped into the stomach through a small oral or nasal tube to produce constant achlorhydria; a now obsolete therapy for certain ulcers. intravenous d. the slow but continuous introduction of solutions intravenously, a drop at a time. Murphy d. SYN: proctoclysis. postnasal d. term sometimes used to describe sensation of mucoid or mucopurulent discharge from the posterior nares.

1. In psychoanalysis, a basic compelling urge. 2. In psychology, classified as either innate ( e.g., hunger) or learned ( e.g., hoarding) and appetitive ( e.g., hunger, thirst, sex) or aversive ( e.g., fear, pain, grief). SEE ALSO: motive, motivation. acquired drives SYN: secondary drives. exploratory d. the d. typical of toddlers and some animals to investigate the unfamiliar or unknown. learned d. SYN: motive (1) . meiotic d. differential fitness in males and females. physiological drives those drives such as hunger and thirst which stem from the biological needs of an organism. SYN: primary drives. primary drives SYN: physiological drives. secondary drives those drives not directly related to biological needs; a secondary d. can be learned as an offshoot of a primary d., in which case it is often referred to as a motive. SYN: acquired drives.

driving (driv′ing)
The induction of a frequency in the electroencephalogram by sensory stimulation at this frequency. photic d. a normal EEG phenomenon whereby the frequency of the activity recorded over the parieto-occipital regions is time-locked to the flash frequency during photic stimulation.

dromomania (drom-o-ma′ne-a)
An uncontrollable impulse to wander or travel. [G. dromos, a running, + mania, insanity]

dromostanolone propionate (dro-mos′tan-o-lon, dro-mo-stan′o-lon)
An antineoplastic agent.

dronabinol (dro-nab′i-nol)
The principal psychoactive substance present in Cannabis sativa, used therapeutically as an antinauseant to control the nausea and vomiting associated with cancer chemotherapy. SEE ALSO: tetrahydrocannabinol.

1. To fall, or to be dispensed or poured in globules. 2. A liquid globule. 3. A volume of liquid regarded as a unit of dosage, equivalent in the case of water to about 1 minim. SEE ALSO: drops. 4. A solid confection in globular form, usually intended to be allowed to dissolve in the mouth. [A.S. droppan] enamel d. SYN: enameloma. hanging d. a d. of liquid on the undersurface of the object glass for examination under the microscope.

droperidol (dro-per′i-dol)
A butyrophenone drug used in neuroleptanalgesia and preanesthetic medication; the pharmacology is similar to that of haloperidol; a dopamine receptor blocker. Exhibits antiemetic effects.

See footdrop.

droplet (drop′let)
A diminutive drop, such as a particle of moisture discharged from the mouth during coughing, sneezing, or speaking; these may transmit infections to others by their airborne passage. [drop + -let, dim. suffix]

SYN: instillator.

A popular term for a medicine taken in doses measured by d., usually a tincture, or applied by dropping, as an eyewash. eye d. See eyewash, ophthalmic solutions, under solution. knock-out d. a popular name for chloral alcoholate given with criminal intent to produce unconsciousness rapidly; it is formed by adding chloral hydrate to beer or some stronger alcoholic liquor. nose d. a liquid preparation intended for intranasal administration with a medicine dropper. Most frequently used for decongestion of the nasal passages but can be used for any other appropriate indication. stomach d. a stomachic tonic, usually tincture of gentian, alone or with other stomachics.

dropsical (drop′si-kal)
SYN: hydropic.

dropsy (drop′se)
Old term for generalized edema, most often associated with cardiac failure. [G. hydrops] abdominal d. SYN: ascites. cardiac d. edema due to heart failure. epidemic d. a disease causing occasional epidemics in India and Mauritius; marked by edema, anemia, eruptive angiomatosis, and mild fever; may be associated with nutritional deficiency. famine d. edema occurring with the hypoproteinemia of low protein intake occurring as starvation of a large population group. nutritional d. edema due to hypoproteinemia secondary to malnutrition. d. of pericardium SYN: pericardial effusion.

Death within 24 hours of immersion in liquid, either due to anoxia or cardiac arrest caused by sudden extreme lowering of temperature (immersion syndrome). SEE ALSO: near d.. dry d. d. by asphyxiation in an individual whose laryngeal reflexes are brisk, resulting in spasm that prevents inhalation of water; may be associated with the highest recovery rate. near d. initial survival following immersion in liquid; the victim may die more than 24 hours later, e.g., from ARDS. secondary d. pulmonary edema and resulting asphyxia, resulting from hypoxia and increased permeability of pulmonary capillaries occurring in a patient who has been immersed in and aspirated some water.

drowsiness (drow′ze-nes)
A state of impaired awareness associated with a desire or inclination to sleep.

Abbreviation of Doctor of Public Health.

drug (drug)
1. Therapeutic agent; any substance, other than food, used in the prevention, diagnosis, alleviation, treatment, or cure of disease. For types or classifications of drugs, see the specific name. SEE ALSO: agent. 2. To administer or take a d., usually implying an overly large quantity or a narcotic. 3. General term for any substance, stimulating or depressing, that can be habituating or addictive, especially a narcotic. [M.E. drogge] addictive d. any d. that creates a certain degree of euphoria and has a strong potential for addiction. crude d. an unrefined preparation, usually of plant origin, that occurs either in the entire, nearly entire, broken, cut, or powdered state. disease modifying antirheumatic drugs agents that apparently alter the course and progression of rheumatoid arthritis, as opposed to more rapidly acting substances that suppress inflammation and decrease pain, but do not prevent cartilage or bone erosion or progressive disability. d. holiday interval when a chronically medicated patient temporarily stops taking the medication; used to allow some recuperation of normal functions, to maintain sensitivity to the d., and to reduce the likelihood of side-effects. nonsteroidal anti-inflammatory drugs (NSAID) a large number of drugs exerting anti-inflammatory (and also usually analgesic and antipyretic) actions; examples include aspirin, acetaminophen, diclofenac, indomethacine, ketorolac, ibuprofen, and naproxen. A contrast is made with steroidal compounds (such as hydrocortisone or prednisone) exerting anti-inflammatory activity. orphan drugs SYN: orphan products, under product. psychedelic d. SYN: hallucinogen. psychodysleptic d. SYN: hallucinogen. psycholytic d. SYN: hallucinogen. psychotomimetic d. SYN: hallucinogen. psychotropic d. any d. that affects the mind. recreational d. SYN: street d.. scheduled d. a d. assigned to any of the five schedules in the Controlled Substances Act (1970). SEE ALSO: controlled substance. street d. a controlled substance taken for non-medical purposes. Street drugs comprise various amphetamines, anesthetics, barbiturates, opiates, and psychoactive drugs, and many are derived from natural sources ( e.g., the plants Papaver somniferum, Cannibis sativa, Amanita pantherina, Lophophora williamsii). Slang names include acid (lysergic acid diethylamide), angel dust (phencyclidine), coke (cocaine), downers (barbiturates), grass (marijuana), hash (concentrated tetrahydrocannibinol), magic mushrooms (psilocybin), and speed (amphetamines). During the 1980s, a new class of “designer drugs” arose, mostly analogs of psychoactive substances intended to escape regulation under the Controlled Substances Act. Also, crack cocaine, a potent, smokable form of cocaine, emerged as a major public health problem. In the U.S. illicit use of drugs such as cocaine, marijuana, and heroin historically has occurred in cycles. SYN: recreational d..

Pertaining to microorganisms that resist or become tolerant to an antibacterial agent.

druggist (drug′ist)
Old common term for pharmacist.

drug interactions
The pharmacological result, either desirable or undesirable, of drugs interacting with other drugs, with endogenous physiologic chemical agents ( e.g., MAOI with epinephrine), with components of the diet, and with chemicals used in diagnostic tests or the results of such tests.

drum, drumhead (drum, drum′hed)
SYN: tympanic membrane.

Sir David, English physician, 1852–1932. See artery of D., D. sign.

drunkenness (drunk′en-nes)
Intoxication, usually alcoholic. SEE ALSO: acute alcoholism. sleep d. a half-waking condition in which the faculty of orientation is in abeyance, and under the influence of nightmarelike ideas the person may become actively excited and violent. SYN: somnolentia (2) .

drusen (droo′sen)
Small bright structures seen in the retina and in the optic disk. [Ger. pl. of Druse, stony nodule, geode] basal laminar d. small, round, translucent lesions measuring 25–75 μm in diameter, which represent nodular thickening of the basement membrane of the retinal pigment epithelium, often with an overlying focal detachment of the retinal pigment epithelium from Bruch membrane. SYN: cuticular d.. basal linear d. deposits of long-spaced collagen located between the plasma membrane and basement membrane of the retinal pigment epithelium. cuticular d. SYN: basal laminar d.. exudative d. accumulations of an amorphous and granular material, cytoplasmic processes, and bent fibers between the basement membrane of the retinal pigment epithelium and the inner collagenous zone of Bruch membrane; types of exudative d. include hard d. and soft d.. SYN: typical d.. hard d. type of exudative or typical d. that appear ophthalmoscopically as discrete, yellow nodules characterized histopathologically by well-defined accumulations of hyaline material in the inner and outer collagenous zones of Bruch membrane. intrapapillary d. SYN: d. of the optic nerve head. d. of the macula excrescences of Bruch membrane that produce a window in the retinal pigment epithelium and are a feature of age-related macular retinal degeneration. SYN: macular d.. macular d. SYN: d. of the macula. d. of the optic nerve head basophilic, laminated, calcareous acellular masses that resemble crystals within the nerve head, anterior to the lamina cribrosa, that may simulate papilledema and/or cause visual field defects. SYN: intrapapillary d.. soft d. type of exudative d. that appear ophthalmoscopically as placoid, yellow lesions characterized histopathologically by localized serous detachments of the retinal pigment epithelium from the Bruch membrane. typical d. SYN: exudative d..

dry ice (dri is)
SYN: carbon dioxide snow.

Abbreviation for double-stranded.

Abbreviation for digital subtraction angiography.

Abbreviation for the Diagnostic and Statistical Manual of Mental Disorders.

Abbreviation for delirium tremens.

Abbreviation for deoxythymidine.

Abbreviation for diphtheria, tetanus, and acellular pertussis vaccine.

SYN: NADPH dehydrogenase (quinone).

Abbreviation for thymidine 5′-diphosphate.

Sugars or sugar derivatives bonded to dTDP.

Abbreviation for delayed-type hypersensitivity.

Abbreviation for thymidine.

Abbreviation for dacarbazine.

Abbreviation for deoxythymidylic acid; thymidine 5′-monophosphate.

Abbreviation for distal tingling on percussion; diphtheria toxoid, tetanus toxoid, and pertussis vaccine; and Demerol, Thorazine, and Phenergan, sometimes used as a sedative.

Abbreviation for diethylenetriamine pentaacetic acid.

Abbreviation for diethylenetriamine pentaacetic acid.

Abbreviation for deep tendon reflex.

Abbreviation for thymidine 5′-triphosphate.

dualism (doo′al-izm)
1. In chemistry, a theory advanced by Berzelius that every compound, no matter how many elements enter into it, is composed of two parts, one electrically negative, the other positive; still applicable, with modification, to polar compounds, but inapplicable to nonpolar compounds. 2. In hematology, the concept that blood cells have two origins, i.e., lymphogenous and myelogenous. 3. The theory that the mind and body are two distinct systems, independent and different in nature. [L. dualis, relating to two, fr. duo, two]

Alexander, U.S. ophthalmologist, 1858–1926. See D. syndrome.

I. Nathan, U.S. pathologist, 1913–1980. See D.-Johnson syndrome.

Eugene F., U.S. physiologist, 1882–1959. See D. formula, Aub-D. table.

Paul A., French obstetrician, 1795–1871. See D. abscesses, under abscess, D. disease.

duboisine (doo-boy′sen)
An alkaloid obtained from the leaves of Duboisia myoporoides (family Solanaceae). See hyoscyamine.

Du Bois-Reymond
Emil H., German physiologist, 1818–1896. See Du Bois-Reymond law.

Jules, French optician, 1817–1886. See D. colorimeter.

Victor, South African-English pediatrician, *1931. See D. score.

Louis, French dentist, 1879–1927. See Dubreuil-Chambardel syndrome.

Guillaume B.A., French neurologist, 1806–1875. See D. disease, D. sign, D.-Aran disease, Aran-D. disease, D.-Erb paralysis, D. dystrophy.

Sir Dyce, English physician, 1840–1928. See D. phenomenon.

Augusto, Italian dermatologist, 1860–1940. See D. bacillus, D. test.

duct (dukt) [TA]
A tubular structure giving exit to the secretion of a gland or organ, capable of conducting fluid. SEE ALSO: canal. SYN: ductus [TA] . [L. duco, pp. ductus, to lead] aberrant ducts SYN: aberrant ductules, under ductule. aberrant bile ducts small ducts occasionally present in the ligaments of the liver or originating from the surface of the liver. accessory pancreatic d. [TA] the excretory d. of the head of the pancreas, one branch of which joins the pancreatic d., the other opening independently into the duodenum at the lesser duodenal papilla. SYN: ductus pancreaticus accessorius [TA] , Bernard canal, Bernard d., ductus dorsopancreaticus, Santorini canal, Santorini d.. alveolar d. 1. the part of the respiratory passages distal to the respiratory bronchiole; from it arise alveolar sacs and alveoli; 2. the smallest of the intralobular ducts in the mammary gland, into which the secretory alveoli open. SYN: ductulus alveolaris. amnionic d. the transitory opening between the seroamnionic folds in birds just before they fuse to form the seroamnionic raphe. anal ducts short ducts lined with simple columnar to stratified columnar epithelium that extend from the valvulae anales to the sinus anales. arterial d. SYN: ductus arteriosus. Bartholin d. SYN: major sublingual d.. Bellini ducts SYN: papillary ducts. Bernard d. SYN: accessory pancreatic d.. bile d. 1. a d. formed by the union of the hepatic and cystic ducts; it discharges at the duodenal papilla. SYN: ductus choledochus [TA] , choledoch d., choledoch, choledochus, common bile d.. 2. any of the ducts conveying bile between the liver and the intestine, including hepatic, cystic, and common bile d.. a d. formed by the union of the hepatic and cystic ducts; it discharges at the duodenal papilla. SYN: ductus biliaris [TA] , biliary d.. biliary d. SYN: bile d. (2) . Blasius d. SYN: parotid d.. Botallo d. SYN: ductus arteriosus. bucconeural d. SYN: craniopharyngeal d.. d. of bulbourethral gland [TA] the long slender d. on each side passing down through the inferior fascia of the urogenital diaphragm to enter the bulb of the penis and course forward 2 or 3 cm before terminating in the urethra. SYN: ductus glandulae bulbourethralis [TA] . canalicular ducts 1. SYN: lactiferous ducts. 2. SYN: biliary ductules, under ductule. carotid d. SYN: ductus caroticus. cervical d. See cervical diverticulum. choledoch d. SYN: bile d. (1) . cochlear d. [TA] a spirally arranged membranous tube suspended within the cochlea, lying between and separating the scala vestibuli and scala tympani; it begins by a blind extremity, the vestibular cecum, in the cochlear recess of the vestibule, terminating in another blind extremity, the cecum cupulare or lagena, at the cupola of the cochlea; it contains endolymph and communicates with the sacculus by the ductus reuniens; the spiral organ (of Corti), the neuroepithelial receptor organ for hearing, occupies the floor of the d.. SYN: ductus cochlearis [TA] , Löwenberg canal, Löwenberg scala, membranous cochlea, scala media. common bile d. SYN: bile d. (1) . common hepatic d. [TA] the part of the biliary d. system that is formed by the confluence of right and left hepatic ducts. At the porta hepatis it is joined by the cystic d. to become the common bile d.. SYN: ductus hepaticus communis [TA] , hepatocystic d.. craniopharyngeal d. the slender tubular part of the hypophysial diverticulum; the stalk of Rathke pocket. SYN: bucconeural d., hypophysial d.. Cuvier ducts obsolete term for the common cardinal veins. cystic d. [TA] the ductus leading from the gallbladder; it joins the hepatic d. to form the common bile d.. SYN: ductus cysticus [TA] , cystic gall d.. cystic gall d. SYN: cystic d.. deferent d. SYN: ductus deferens. efferent d. SYN: efferent ductules of testis, under ductule. ejaculatory d. [TA] the d. formed by the union of the deferent d. and the excretory d. of the seminal vesicle, which opens into the prostatic urethra. SYN: ductus ejaculatorius [TA] , spermiduct (2) . endolymphatic d. [TA] a small membranous canal, connecting with both saccule and utricle of the membranous labyrinth, passing through the aqueduct of vestibule, and terminating in a dilated blind extremity, the endolymphatic sac, on the posterior surface of the petrous portion of the temporal bone beneath the dura mater. SYN: ductus endolymphaticus [TA] . d. of epididymis [TA] a convoluted tube into which the efferent ductules open and which itself terminates in the ductus deferens. SYN: ductus epididymidis [TA] . excretory d. a d. carrying the secretion from a gland or a fluid from any reservoir. SYN: ductus excretorius. excretory ducts of lacrimal gland the multiple (6–10) excretory ducts of the lacrimal gland that open into the superior fornix of the conjunctival sac. SYN: ductuli excretorii glandulae lacrimalis, excretory ductules of lacrimal gland. excretory d. of seminal gland [TA] the passage leading from a seminal vesicle to the ejaculatory d.. SYN: ductus excretorius vesiculae seminalis [TA] , excretory d. of seminal vesicle&star. excretory d. of seminal vesicle excretory d. of seminal gland. frontonasal d. the passage that leads downward from the frontal sinus to open into the ethmoidal infundibulum. galactophorous ducts SYN: lactiferous ducts. gall d. obsolete term for bile d.. Gartner d. SYN: longitudinal d. of epoöphoron. genital d. SYN: genital tract. guttural d. SYN: pharyngotympanic (auditory) tube. hemithoracic d. an accessory thoracic d., usually emptying into the thoracic d. but sometimes discharging independently into the right subclavian vein. SYN: ductus hemithoracicus. Hensen d. SYN: ductus reuniens. hepatic d. See common hepatic d., right hepatic d., left hepatic d.. hepatocystic d. SYN: common hepatic d.. Hoffmann d. SYN: pancreatic d.. hypophysial d. SYN: craniopharyngeal d.. incisive d. [TA] an infrequent rudimentary d., or protrusion of the mucous membrane into the incisive canal, on either side of the anterior extremity of the nasal crest. SYN: ductus incisivus [TA] . intercalated ducts the minute ducts of glands, such as the salivary and the pancreas, that lead from the acini; they are lined by low cuboidal cells. interlobar d. a d. draining the secretion of the lobe of a gland and formed by the junction of a number of interlobular ducts. interlobular d. any d. leading from a lobule of a gland and formed by the junction of the intralobular ducts. intralobular d. a d. that lies within a lobule of a gland. jugular d. SYN: jugular lymphatic trunk. lactiferous ducts [TA] one of the ducts, numbering 15–20, which drain the lobes of the mammary gland; they open at the nipple. SYN: ductus lactiferi [TA] , canalicular ducts (1) , galactophore, galactophorous canals, galactophorous ducts, mamillary ducts, mammary ducts, milk ducts, tubuli galactophori, tubuli lactiferi. left d. of caudate lobe of liver [TA] a tributary to the left hepatic d. draining bile from the left half of the caudate lobe. SYN: ductus lobi caudati sinister hepatis [TA] . left hepatic d. [TA] the d. that drains bile from the left half of the liver, including the quadrate lobe and the left part of the caudate lobe. SYN: ductus hepaticus sinister [TA] . longitudinal d. of epoöphoron [TA] a rudimentary vestige of the mesonephric d. in the female into which the tubules of the epoöphoron open; it is located in the broad ligament of the uterus, parallel with the lateral part of the uterine tube, and in the lateral walls of the cervix and vagina. SYN: ductus longitudinalis epoöphori [TA] , ductus deferens vestigialis, Gartner canal, Gartner d.. Luschka ducts glandlike tubular structures in the wall of the gallbladder, especially in the part covered with peritoneum. lymphatic d. one of the two large lymph channels, right lymphatic d. or thoracic d.. major sublingual d. [TA] the d. that drains the anterior portion of the sublingual gland; it opens at the sublingual papilla. SYN: ductus sublingualis major [TA] , Bartholin d.. mamillary ducts SYN: lactiferous ducts. mammary ducts SYN: lactiferous ducts. mesonephric d. a d. in the embryo draining the mesonephric tubules; in the male it becomes the ductus deferens; in the female it becomes vestigial. SEE ALSO: longitudinal d. of epoöphoron. SYN: ductus mesonephricus, wolffian d.. metanephric d. the slender tubular portion of the metanephric diverticulum; the primordium of the epithelial lining of the ureter. See epoophoron, longitudinal d. of epoöphoron. milk ducts SYN: lactiferous ducts. minor sublingual ducts [TA] from 8–20 small ducts of the sublingual salivary gland that open into the mouth on the surface of the sublingual fold; a few join the submandibular ducts. SYN: ductus sublinguales minores [TA] , Rivinus ducts, Walther canals, Walther ducts. Müller d., müllerian d. SYN: paramesonephric d.. nasal d. SYN: nasolacrimal d.. nasolacrimal d. [TA] the passage leading downward from the lacrimal sac on each side to the anterior portion of the inferior meatus of the nose, through which tears are conducted into the nasal cavity. SYN: ductus nasolacrimalis [TA] , nasal d.. nephric d. SYN: pronephric d.. omphalomesenteric d. obsolete term for yolk stalk. pancreatic d. [TA] the excretory d. of the pancreas that extends through the gland from tail to head where it empties into the duodenum at the greater duodenal papilla. SYN: ductus pancreaticus [TA] , Hoffmann d., Wirsung canal, Wirsung d.. papillary ducts the largest straight excretory ducts in the kidney medulla and papillae whose openings form the area cribrosa that open into a minor calyx; they are a continuation of the collecting tubules. SYN: Bellini ducts. paramesonephric d. either of the two paired embryonic tubes extending along the mesonephros roughly parallel to the mesonephric d. and emptying into the cloaca; in the female, the upper parts of the ducts form the uterine tubes, while the lower fuse to form the uterus and part of the vagina; in the male, vestiges of the ducts form the vagina masculina and the appendix testis. SYN: ductus paramesonephricus, Müller d., müllerian d.. paraurethral ducts [TA] inconstant ducts along the side of the female urethra that convey the mucoid secretion of Skene glands to the vestibule. SYN: ductus paraurethrales [TA] , ducts of Skene glands, Schüller ducts. parotid d. [TA] the d. of the parotid gland opening from the cheek into the vestibule of the mouth opposite the neck of the superior second molar tooth. SYN: ductus parotideus [TA] , Blasius d., Stensen d., Steno d.. Pecquet d. SYN: thoracic d.. perilymphatic d. SYN: cochlear aqueduct. pharyngobranchial ducts ductus pharyngobranchialis III, ductus pharyngobranchialis IV. pronephric d. the d. of the pronephros. SYN: nephric d.. prostatic ducts SYN: prostatic ductules, under ductule. right d. of caudate lobe of liver [TA] the bile d. from the right half of the caudate lobe, a tributary to the right hepatic d.. SYN: ductus lobi caudati dexter hepatis [TA] . right hepatic d. [TA] the d. that transmits bile to the common hepatic d. from the right half of the liver and the right part of the caudate lobe. SYN: ductus hepaticus dexter [TA] . right lymphatic d. [TA] one of the two terminal lymph vessels, a short trunk, about 2 cm in length, formed by the union of the right jugular lymphatic vessel and vessels from the lymph nodes of the right superior limb, thoracic wall, and both lungs; it lies on the right side of the root of the neck and empties into the right brachiocephalic vein. Frequently, no right lymphatic d. is formed, with the vessels that normally contribute to its formation entering the venous system independently. SYN: ductus lymphaticus dexter [TA] , ductus thoracicus dexter&star. Rivinus ducts SYN: minor sublingual ducts. saccular d. [TA] saccular portion of the utriculosaccular d.; extends between the sacculus and the endolymphatic d.. SEE ALSO: utriculosaccular d.. SYN: ductus saccularis [TA] . salivary d. SYN: striated d.. Santorini d. SYN: accessory pancreatic d.. Schüller ducts SYN: paraurethral ducts. secretory d. SYN: striated d.. semicircular ducts [TA] three small membranous tubes in the bony semicircular canals that lie within the bony labyrinth and form loops of about two-thirds of a circle. The three semicircular ducts: anterior semicircular d. [TA] (ductus semicircularis anterior [TA]), lateral semicircular d. [TA] (ductus semicircularis lateralis [TA]), and posterior semicircular d. [TA] (ductus semicircularis posterior [TA]), lie in planes at right angles to each other and open into the vestibule by five openings of which one is common to the anterior and lateral ducts. Each d. has an ampulla at one end within which filaments of the vestibular nerve terminate. SYN: ductus semicirculares [TA] . seminal d. any one of the ducts conveying semen from the epididymis to the urethra, ductus deferens, or ejaculatory d.. SYN: gonaduct (1) . ducts of Skene glands SYN: paraurethral ducts. spermatic d. SYN: ductus deferens. Stensen d., Steno d. SYN: parotid d.. striated d. a type of intralobular d. found in some salivary glands that modifies the secretory product; it derives its name from extensive infolding of the basal membrane. SYN: salivary d., secretory d.. subclavian d. SYN: subclavian lymphatic trunk. submandibular d. [TA] the d. of the submandibular salivary gland; it opens at the sublingual papilla near the frenulum of the tongue. SYN: ductus submandibularis [TA] , ductus submaxillaris, submaxillary d., Wharton d.. submaxillary d. SYN: submandibular d.. sudoriferous d. SYN: d. of sweat glands. sweat d. SYN: d. of sweat glands. d. of sweat glands the superficial portion of the sweat gland that passes through the corium and epidermis, opening on the surface by the porus sudoriferus or sweat pore. SYN: ductus sudoriferus, sudoriferous d., sweat d.. testicular d. SYN: ductus deferens. thoracic d. [TA] the largest lymph vessel in the body, beginning at the cisterna chyli at about the level of the second lumbar vertebra; the abdominal part extends superiorly to pass through the aortic opening of the diaphragm, where it becomes the thoracic part and crosses the posterior mediastinum to form the arch of the thoracic d. and discharge into the left venous angle (origin of the brachiocephalic vein). SYN: ductus thoracicus [TA] , Pecquet d., van Horne canal. thyroglossal d. [TA] a transitory endodermal tube in the embryo, carrying thyroid-forming tissue at its caudal end; normally, the d. disappears after the thyroid has moved to its definitive location in the neck; its point of origin is regularly marked on the root of the adult tongue by the foramen cecum; occasionally, its incomplete regression results in the formation of cysts along its embryonic course. SEE ALSO: pyramidal lobe of thyroid gland. SYN: ductus thyroglossus [TA] , thyrolingual d.. thyrolingual d. SYN: thyroglossal d.. umbilical d. SYN: yolk stalk. uniting d. SYN: ductus reuniens. utricular d. [TA] utricular portion of the utriculosaccular d.; extends between the utriculus and the endolymphatic d.. SEE ALSO: utriculosaccular d.. SYN: ductus utricularis [TA] . utriculosaccular d. [TA] a d. that connects the inner aspect of the utricle with the endolymphatic d. a short distance from its origin from the saccule. SYN: ductus utriculosaccularis [TA] , Böttcher canal. vitelline d., vitellointestinal d. SYN: yolk stalk. Walther ducts SYN: minor sublingual ducts. Wharton d. SYN: submandibular d.. Wirsung d. SYN: pancreatic d.. wolffian d. SYN: mesonephric d..

ductal (duk′tal)
Relating to a duct.

ductile (duk′til)
Denoting the property of a material that allows it to be bent, drawn out (as a wire), or otherwise deformed without breaking. [L. ductilis, capable of being led or drawn]


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