|Medical Dictionary - Dictionary of Medicine and Human Biology|
Influenced by ventricular contraction; applied to the atrial rhythm when this is modified by ventricular contraction; in v. sinus arrhythmia in complete AV block the sinus impulse immediately following a ventricular contraction usually appears sooner than expected.
Any surgical procedure to repair a defect of one of the ventricles of the heart. [ventriculo- + G. plastos, formed] reduction left v. SYN: left ventricular volume reduction surgery.
Insertion of a needle into a ventricle.
Direct inspection of a ventricle with an endoscope. [ventriculo- + G. skopeo, to view]
Establishment of an opening in a ventricle, usually through the floor of the third ventricle to the subarachnoid space to relieve hydrocephalus. SEE ALSO: shunt (2) . [ventriculo- + G. stoma, mouth] third v. an operation to establish an opening from the third ventricle to the prechiasmal and interpeduncular cisterns (Stookey-Scarff operation) or from the third ventricle to the interpeduncular cistern (Dandy operation).
Relating to the space occupied by the cerebrospinal fluid. [ventriculo- + subarachnoid]
Incision into a ventricle; e.g., into the cerebral third ventricle for the relief of hydrocephalus or into a cardiac ventricle to surgically correct an abnormality. [ventriculo- + G. tome, incision]
ventriculus, pl .ventriculi (ven-trik′u-lus, -li) [TA]
1. SYN: stomach. 2. SYN: ventricle. 3. The enlarged posterior portion of the mesenteron of the insect alimentary canal, in which digestion occurs. [L. dim. of venter, belly] v. cordis dexter/sinister SYN: (right/left) ventricles of heart, under ventricle. v. dexter [TA] SYN: right ventricle. v. laryngis [TA] SYN: laryngeal ventricle. v. lateralis [TA] SYN: lateral ventricle. v. quartus [TA] SYN: fourth ventricle. v. quintus SYN: cavity of septum pellucidum. v. sinister [TA] SYN: left ventricle. v. terminalis [TA] SYN: terminal ventricle. v. tertius [TA] SYN: third ventricle.
To draw toward the abdomen. [L. venter, belly, + duco, pp. ductus, to lead]
Drawing toward the abdomen or abdominal wall.
Ventral. [L. venter, belly]
SYN: cystopexy. [ventro- + G. kystis, cyst, + rhaphe, suture]
In a direction from the venter to the dorsum.
Relating to the abdomen and the groin.
Both ventral and lateral, i.e., to the front and to the side.
Relating to the midline of the ventral surface.
ventroptosis, ventroptosia (ven-tro-to′sis, -to′se-a)
SYN: gastroptosis. [ventro- + G. ptosis, a falling]
SYN: peritoneoscopy. [ventro- + G. skopeo, to view]
SYN: celiotomy. [ventro- + G. tome, incision]
Giovanni B., Italian physicist, 1746–1822. See V. effect, V. meter, V. tube.
venula, pl .venulae (ven′oo-la, -le) [TA]
SYN: venule. [L. dim. of vena, vein] v. macularis inferior [TA] SYN: inferior macular venule. v. macularis superior [TA] SYN: superior macular venule. v. medialis retinae [TA] SYN: medial venule of retina. v. nasalis retinae inferior [TA] SYN: inferior nasal retinal venule. v. nasalis retinae superior [TA] SYN: superior nasal retinal venule. venulae rectae of kidney [TA] venules that drain the medullary pyramids of the kidney; they open into arcuate veins. SYN: venulae rectae renis [TA] , straight venules of kidney. venulae rectae renis [TA] SYN: venulae rectae of kidney. venulae stellatae the star-shaped groups of venules in the renal cortex. SYN: stellate veins, stellate venules, stellulae verheyenii, venae stellatae, Verheyen stars. v. temporalis retinae inferior [TA] SYN: inferior temporal retinal venule. v. temporalis retinae superior [TA] SYN: superior temporal retinal venule.
Pertaining to venules. SYN: venulous.
venule (ven′ool, ve′nool) [TA]
A venous radicle continuous with a capillary. SYN: venula [TA] , capillary vein, veinlet. high endothelial postcapillary venules venules in the lymph nodes, tonsils, and Peyer patches that have a high-walled endothelium through which blood lymphocytes migrate from the blood into the lymphatic parenchyma. inferior macular v. [TA] a small tributary of the central vein of the retina that drains the lower part of the macula. SYN: venula macularis inferior [TA] . inferior nasal v. of retina SYN: inferior nasal retinal v.. inferior nasal retinal v. [TA] the small vein that passes from the inferior medial (nasal) part of the retina to join the central vein. SYN: venula nasalis retinae inferior [TA] , inferior nasal v. of retina. inferior temporal v. of retina SYN: inferior temporal retinal v.. inferior temporal retinal v. [TA] the small vein that passes from the lower lateral (temporal) part of the retina to enter the central vein. SYN: venula temporalis retinae inferior [TA] , inferior temporal v. of retina. medial v. of retina [TA] the small vein that passes from the part of the retina between the macula and the optic disk to join the central vein. SYN: venula medialis retinae [TA] . nasal venules of retina inferior nasal retinal v., superior nasal retinal v.. pericytic venules SYN: postcapillary venules. postcapillary venules the microvasculature immediately following the capillaries, ranging in size from 10 to 50 μm, and characterized by investment of pericytes; they are the site of extravasation of blood cells, are particularly sensitive to histamine, and are believed to be important in blood-interstitial fluid exchanges. SYN: pericytic venules. stellate venules SYN: venulae stellatae, under venula. straight venules of kidney SYN: venulae rectae of kidney, under venula. superior macular v. [TA] a small tributary of the central vein of the retina that drains the upper part of the macula. SYN: venula macularis superior [TA] . superior nasal v. of retina SYN: superior nasal retinal v.. superior nasal retinal v. [TA] the small vein that drains blood from the upper medial (nasal) part of the retina; it joins the central vein. SYN: venula nasalis retinae superior [TA] , superior nasal v. of retina. superior temporal v. of retina SYN: superior temporal retinal v.. superior temporal retinal v. [TA] the v. that passes from the upper lateral (temporal) part of the retina to join the central vein. SYN: venula temporalis retinae superior [TA] , superior temporal v. of retina. temporal venules of retina inferior temporal retinal v., superior temporal retinal v..
Abbreviation for visual evoked response. See evoked response.
A calcium channel blocking agent used to treat cardiac arrhythmias and angina pectoris. SYN: iproveratril.
veratric acid (ve-rat′rik)
Obtained by methylation and subsequent oxidation of protocatechuic acid; present in the seeds of Schoenocaulon officinale (Sabadilla officinarum).
An alkaloid derived from Veratrum viridae and V. album. Probably responsible for antihypertensive properties of this class of alkaloids.
veratrine (ver′a-tren, -trin)
A mixture of alkaloids from the seeds of Schoenocaulon officinale (Sabadilla officinarum) (family Liliaceae), including cevine, cevadine, cevadilline, sabadine, and veratridine; a powder of acrid taste, intensely irritating to the nasal mucous membrane, that has been used as an anodyne counterirritant in neuralgias and arthritis.
A genus of toxic liliaceous plants. [L. hellebore] V. album the rhizome has emetic and cathartic actions. V. viride the dried rhizome and roots contain therapeutically important alkaloids (cevadine, veratridine, jervine, pseudojervine, rubijervine, and several ester alkaloids of the base germine) used in the treatment of hypertensive disorders.
Constant repetition of meaningless words or phrases; seen in schizophrenia. SYN: oral stereotypy. [L. verbum, word, + gero, to carry about]
A rarely used term for an abnormal talkativeness; a psychotic flow of speech. [L. verbum, word, + G. mania, frenzy]
verdigris (ver′di-gres, -gris, -gre)
Cupric acetate (normal). [O. Fr. verd, green, de, of, Gris, Greeks]
Obsolete term for choleglobin.
An intermediate stage in hemoglobin degradation to yield the bile pigments, i.e., hemoglobin yields choleglobin (verdohemoglobin) and the loss of globin leaves v., the precursor of biliverdin.
A peroxidase, occurring in leukocytes, that contains a greenish ferriheme; responsible for the peroxidase activity of pus.
Andrea, Italian neurologist, 1811–1895. See V. ventricle, cavum vergae.
An edge or margin. anal v. the transitional zone between the moist, hairless, modified skin of the anal canal and the perianal skin.
A disjunctive movement of the eyes in which the fixation axes are not parallel, as in convergence or divergence. [L. vergo, to incline, to turn] v. of lens the reciprocal of the principal focal distance used as a measure of the divergence or convergence of parallel rays.
Philippe, Flemish anatomist, 1648–1710. See V. stars, under star, stellulae verheyenii, under stellula.
Frederick H., U.S. ophthalmologist, 1874–1968. See V. elastic tissue stain.
Archaic term for a subkingdom of the animal kingdom containing worms and wormlike organisms; an unnatural division no longer in taxonomic use. [L. vermis, worm]
A worm; wormlike. [L. vermis]
Destructive to worms; specifically, destructive to parasitic intestinal worms. [vermi- + L. caedo, to kill]
An agent that kills intestinal parasitic worms. [vermi- + L. caedo, to kill]
Relating to, resembling, or moving like a worm. [L. vermiculus, dim. of vermis, worm]
A wormlike movement, as in peristalsis.
1. A small worm or wormlike organism or structure. 2. SYN: ookinete. [L. vermiculus, a small worm]
vermiculose, vermiculous (ver-mik′u-los, -lus)
1. Wormy; infected with worms or larvae. 2. Wormlike. SEE ALSO: vermiform.
See vermicule. [L. dim. of vermis, worm]
Worm-shaped; resembling a worm in form, denoting especially the appendix of the cecum. SEE ALSO: lumbricoid, scolecoid (2) . [vermi- + L. forma, form]
SYN: anthelmintic (2) . [vermi- + L. fugo, to chase away]
SYN: anthelmintic (1) . [vermi- + L. fugo, to chase away]
vermilion (ver-mil′yon) [C.I. 77766]
A red pigment made from cinnabar or red mercuric sulfide.
Excision of the vermilion border of the lip. [vermilion border + G. ektome, cutting out]
Parasitic insects, such as lice and bedbugs. [L. vermis, a worm]
1. The production or breeding of worms or larvae. 2. Infestation with vermin.
Relating to, caused by, or infested with worms, larvae, or vermin. SYN: verminal. [L. verminosus, wormy]
vermis, pl .vermes (ver′mis, -mez)
1. A worm; any structure or part resembling a worm in shape. 2. [TA] V. cerebelli, the narrow middle zone between the two hemispheres of the cerebellum; the portion projecting above the level of the hemispheres on the upper surface is called the superior v.; the lower portion, sunken between the two hemispheres and forming the floor of the vallecula, is the inferior v.. [L. worm]
SYN: appendix (2) .
John, U.S. internist, *1927. See V.-Morrison syndrome.
Maurice, French neurologist, 1887–1974. See V. syndrome.
Pierre, French mathematician, 1580–1637. See V. acuity.
SYN: varnish (dental). [Mod. L.] v. caseosa the fatty substance, consisting of desquamated epithelial cells, lanugo hairs, and sebaceous matter, which covers the skin of the fetus.
José, Czechoslovakian pathologist, 1876–1927. See V. bodies, under body.
verruca, pl .verrucae (ve-roo′ka, -ke)
A flesh-colored growth characterized by circumscribed hypertrophy of the papillae of the corium, with thickening of the malpighian, granular, and keratin layers of the epidermis, caused by human papilloma virus; also applied to epidermal verrucous tumors of nonviral etiology. SYN: verruga, wart. [L.] v. digitata a wart in which the papillae project like fingers; they occur in groups, often on the scalp. SYN: digitate wart. v. filiformis a wart composed of a single or many greatly elongated papillae; appears more commonly on the face and neck. SYN: filiform wart. v. peruana, v. peruviana SYN: verruga peruana. v. plana a smooth, flat, flesh-colored wart of small size, occurring in groups, seen especially on the face of the young; often associated with common warts of the hands, due to human papilloma virus, commonly, types 3 and 10. SYN: flat wart, plane wart, v. plana juvenilis. v. plana juvenilis SYN: v. plana. v. plana senilis SYN: actinic keratosis. v. plantaris SYN: plantar wart. seborrheic v. SYN: seborrheic keratosis. v. senilis SYN: actinic keratosis. v. simplex SYN: v. vulgaris. v. vulgaris a keratotic papilloma of the epidermis which occurs most frequently in young persons as a result of localized infection by human papilloma virus, usually types 2 and 4; the lesions are of variable duration, eventually undergoing spontaneous regression, and are both exophytic and endophytic, with hyperkeratosis, parakeratosis, hypergranulosis, koilocytosis, and papillomatosis. SYN: common wart, infectious wart, v. simplex, viral wart.
Wart-shaped. [L. verruca, wart, + forma, form]
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