junction

junction (jungk´shun)

junctura (2)
amelodental j. , amelodentinal j. rarely used terms for dentinoenamel j.
amnioembryonic j. the line of amniotic attachment to the periphery of the embryonic disk.
anorectal j. 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.
A-V j. imprecisely defined zone surrounding and including the A-V node and the adjacent atrial and ventricular myocardium.
cardioesophageal j. the abrupt transition from esophageal mucosa to that of the cardiac portion of stomach, demarcated internally in the living by the z-line, and approximated externally by the cardiac notch.
cementodentinal j. the surface at which the cementum and dentin of the root of a tooth are joined.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.
costochondral j. costochondral joint
dentinocemental j. 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.
electrotonic j. gap j
esophagogastric j. terminal end of esophagus and beginning of stomach at the cardiac orifice; site of the physiologic inferior esophageal sphincter.
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.electrotonic j., electrotonic synapse, macula communicans, nexus;
Holliday j. the cross-strand structure formed when two DNA duplexes cross in a recombination event.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.
intercellular j.'s 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 junction).
intermediate j. zonula adherens
j. of lips commissure of lips
manubriosternal j. sternal angle
mucocutaneous j. the site of transition from epidermis to the epithelium of a mucous membrane.
muscle-tendon j. muscle-tendon attachment
myoneural j. the synaptic connection of the axon of the motor neuron with a muscle fiber. See motor endplate.neuromuscular j;
neuroectodermal j. the margin of the embryonic neural plate separating it from the embryonic ectoderm; cells from this region form the neural crest.neurosomatic j;
neuromuscular j. myoneural j
neurosomatic j. neuroectodermal j
rectosigmoid j. the site where 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.acceptor splicing site;
sacrococcygeal j. sacrococcygeal joint
sclerocorneal j. limbus of cornea
squamocolumnar j. the site of transition from stratified squamous epithelium to columnar epithelium, usually characterized by stratified columnar epithelium.
ST j. J point
sternomanubrial j. manubriosternal symphysis
tight j. an intercellular j. between epithelial cells in which the outer leaflets of lateral cell membranes fuse to form a variable number of parallel interweaving strands that greatly reduce transepithelial permeability to macromolecules, solutes, and water via the paracellular route.
tympanostapedial j. the connection of the base or foot-plate of the stapes with the vestibular (oval) window.syndesmosis tympanostapedia [NA] ;
ureteropelvic j. (UPJ) site of origin of the ureter from the renal pelvis, a common location for congenital or acquired obstruction.

 

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