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Medical Dictionary


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junction (jungk′shun) [TA]
The point, line, or surface of union of two parts, mainly bones or cartilages. SYN: juncture. SYN: junctura (2) [TA] , junctio&star. adhering junctions intercellular junctions, including zonulae adherentes, hemidesmosomes, and desmosomes, that primarily serve to bind cells together physically. amelodental j., amelodentinal j. rarely used terms for dentinoenamel j.. amnioembryonic j. the line of amnionic attachment to the periphery of the embryonic disk. anorectal j. [TA] transition from rectum to anal canal; corresponds to the perineal flexure, or the level at which the gut perforates the pelvic diaphragm; here the rectal ampulla narrows abruptly into a narrow slip. SYN: junctio anorectalis [TA] . AV j. imprecisely defined zone surrounding and including the AV node and the adjacent atrial and ventricular myocardium. cardioesophageal j. SYN: esophagogastric j.. cementodentinal j. the surface at which the cementum and dentin of the root of a tooth are joined. SYN: dentinocemental j.. cementoenamel j. the surface at which the enamel of the crown and the cementum of the root of a tooth are joined. SEE ALSO: cervical line. choledochoduodenal j. that part of the duodenal wall traversed by the ductus choledochus, ductus pancreaticus, and ampulla. communicating j. SYN: gap j.. corneoscleral j. SYN: corneal limbus. costochondral junctions SYN: costochondral joints, under joint. dentinocemental j. SYN: cementodentinal j.. dentinoenamel j. the surface at which the enamel and the dentin of the crown of a tooth are joined. duodenojejunal j. point along the course of the gastrointestinal tract where the duodenum ends and the jejunum begins; occurs approximately at the level of the L2 vertebra, 2–3 cm to the left of the midline; usually takes the form of an acute angle, the duodenojejunal flexure, and is supported by the attachment of the suspensory muscle (ligament) of the duodenum. SEE ALSO: duodenojejunal flexure. electrotonic j. SYN: gap j.. esophagogastric j. terminal end of esophagus and beginning of stomach at the cardiac orifice; site of the physiologic inferior esophageal sphincter. SYN: cardioesophageal j.. gap j. 1. an intercellular j. formerly considered to be a tight, membrane-to-membrane j. (macula occludens) but now shown to have a 2-nm gap between apposed cell membranes; the gap is not void but contains subunits in the form of polygonal lattices; it occurs in epithelia, between certain nerve cells, and in smooth and cardiac muscle; it is believed to mediate electrotonic coupling which allows ionic currents to pass from one cell to another. SEE ALSO: synapse. 2. areas of increased electrochemical communication between myometrial cells which aid in the propagation of the contractions of labor. SYN: communicating j., electrotonic j., electrotonic synapse, macula communicans, nexus. Holliday j. the cross-strand structure formed when two DNA duplexes cross in a recombination event. SYN: Holliday structure. ileocecal j. point along the course of the gastrointestinal tract where the small intestine (ileum) ends as it opens into the cecal portion of the large intestine; occurs usually within the iliac fossa, demarcated internally as the ileocecal orifice. impermeable j. SYN: zonula occludens. intercellular junctions specializations of the cellular margins that contribute to the adhesion or allow for communication between cells; they include the macula adherens (desmosome), zonula adherens, zonula occludens, and nexus (gap j.). intermediate j. SYN: zonula adherens. j. of lips SYN: commissure of lips. manubriosternal j. SYN: sternal angle. mucocutaneous j. the site of transition from epidermis to the epithelium of a mucous membrane. muscle-tendon j. SYN: muscle-tendon attachment. myoneural j. the synaptic connection of the axon of the motor neuron with a muscle fiber. See motor endplate. SYN: neuromuscular j.. neuroectodermal j. the margin of the embryonic neural plate separating it from the embryonic surface ectoderm; cells from this region form the neural crest. SYN: neurosomatic j.. neuromuscular j. SYN: myoneural j.. neurosomatic j. SYN: neuroectodermal j.. rectosigmoid j. the site at which the sigmoid colon becomes the rectum; usually takes the form of an acute angle, demarcated externally by a discontinuation of appendices epiploicae, a spreading out of the teniae coli to completely encircle the rectum, and consequently, termination of the sacculations (haustrae) between the teniae. right splicing j. boundary between the right end of an intron and the left end of the adjacent exon. SYN: acceptor splicing site. sacrococcygeal j. SYN: sacrococcygeal joint. sclerocorneal j. SYN: corneal limbus. squamocolumnar j. the site of transition from stratified squamous epithelium to columnar epithelium, usually characterized by stratified coboidal epithelium. ST j. SYN: J point. sternomanubrial j. SYN: manubriosternal symphysis. tight j. SYN: zonula occludens. tympanostapedial j. SYN: tympanostapedial syndesmosis. ureteropelvic j. (UPJ) site of origin of the ureter from the renal pelvis, a common location for congenital or acquired obstruction. ureterovesical j. the site of entry of the ureter into the bladder, with an oblique angulation through the detrusor to avoid reflux. SEE ALSO: vesicoureteral reflux.

junctura, pl .juncturae (jungk-too′ra, -re) [TA]
1. SYN: joint. 2. SYN: junction. [L. a joining] j. cartilaginea [TA] SYN: cartilaginous joint. j. fibrosa [TA] SYN: fibrous joint. j. lumbosacralis SYN: lumbosacral joint. juncturae membri inferioris liberi SYN: synovial joints of free lower limb, under joint. juncturae membri superioris SYN: joints of pectoral girdle, under joint. juncturae membri superioris liberi SYN: synovial joints of free upper limb, under joint. juncturae ossium alternative name for articulationes. See articulatio. j. sacrococcygea SYN: sacrococcygeal joint. j. synovialis [TA] SYN: synovial joint. juncturae tendinum SYN: intertendinous connections of extensor digitorum, under connection. juncturae zygapophysiales SYN: zygapophysial joints, under joint.

juncture (jungk′choor)
SYN: junction.

Jung
Carl Gustav, Swiss psychiatrist and psychologist, 1875–1961. See jungian psychoanalysis.

Jung
Karl G., Swiss anatomist, 1793–1864. See J. muscle.

jungian (yung′e-an)
The psychological system or the psychoanalytic form of treatment deriving from it; developed by Carl Gustav Jung.

Jüngling
Adolph O., German surgeon, 1884–1944. See J. disease.

juniper (joo′ni-per)
The dried ripe fruit of Juniperus communis (family Pinaceae). [L. the j. tree] j. berry oil SYN: oil of j.. j. tar the empyreumatic volatile oil obtained from the woody portion of Juniperus oxycedrus; used externally for skin diseases. SYN: cade oil.

jurisprudence (joor-is-proo′dens)
The science of law, its principles and concepts. [L. juris prudentia, knowledge of law] dental j. SYN: forensic dentistry. medical j. SYN: forensic medicine.

justice
The ethical principle that persons who have similar circumstances and conditions should be treated alike; sometimes known as distributive j.. [L. justitia, fr. jus, right, law]

justo major (jus′to ma′jer)
See pelvis j..

justo minor (jus′to mi′ner)
See pelvis j..

juvenile delinquent
A minor who cannot be controlled by parental authority and commits antisocial or criminal acts, such as vandalism, violence, or robbery.

juxtacrine (juks′ta-krin)
A mode of hormone action that requires the cell producing the effector to be in direct contact with the cell containing the appropriate receptor. [L. juxta, close to, + G. krino, to separate]

juxtaepiphysial (juks′ta-ep-i-fiz′e-al)
Close to or adjoining an epiphysis.

juxtaglomerular (juks′ta-glo-mer′u-lar)
Close to or adjoining a renal glomerulus.

juxtallocortex (juks′ta-lo-kor′teks)
O. Vogt collective term for several regions of the cerebral cortex which occupy an intermediate position between the isocortex and the allocortex.

juxtamedullary (juks′ta-med′u-lar-e)
Close to or adjoining the medullary border.

juxtaposition (juks-ta-po-zish′un)
A position side by side. SEE ALSO: apposition, contiguity. [L. juxta, near to, + positio, a placing, fr. pono, pp. positus, to place]




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