junction /junc·tion/ (-shun) the place of meeting or coming together.junc´tional
adherent junction a type of intercellular junction that links cell membranes and cytoskeletal elements within and between cells, connecting adjacent cells mechanically.
amelodentinal junction dentinoenamel j.
atrioventricular junction , AV junction part or all of the region comprising the atrioventricular node and the bundle of His, with the bundle branches sometimes specifically excluded.
cementoenamel junction the line at which the cementum covering the root of a tooth and the enamel covering its crown meet, designated anatomically as the cervical line.
dentinocemental junction the line of meeting of the dentin and cementum on the root of a tooth.
dentinoenamel junction the plane of meeting between dentin and enamel on the crown of a tooth.
esophagogastric junction the site of transition from the stratified squamous epithelium of the esophagus to the simple columnar epithelium of the cardia of the stomach.
gap junction a narrowed portion of the intercellular space containing channels linking adjacent cells and through which pass ions, most sugars, amino acids, nucleotides, vitamins, hormones, and cyclic AMP. In electrically excitable tissues, these gap junctions transmit electrical impulses via ionic currents and are known as electrotonic synapses. 
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Gap junctions providing passageways between the interiors of adjacent cells.
gastroesophageal junction esophagogastric j.
ileocecal junction the junction of the ileum and cecum, located at the lower right side of the abdomen and fixed to the posterior abdominal wall.
intercellular junctions specialized regions on the borders of cells that provide connections between adjacent cells.
mucocutaneous junction the site of transition between skin and mucous membrane.
mucogingival junction the histologically distinct line marking the separation of the gingival tissue from the oral mucosa.
myoneural junction , neuromuscular junction the site of apposition between a nerve fiber and the motor end plate of the skeletal muscle which it innervates.
occluding junction tight j.
sclerocorneal junction corneal limbus.
tight junction an intercellular junction at which adjacent plasma membranes are joined tightly together by interlinked rows of integral membrane proteins, limiting or eliminating the intercellular passage of molecules.
ureteropelvic junction the junction between the ureter and the renal pelvis.
e·soph·a·go·gas·tric junction ( -s f  -g -g s trk)n. The line at the cardiac orifice of the stomach where there is a transition from the stratified squamous epithelium of the esophagus to the simple columnar epithelium of the stomach. |
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