junction /junc·tion/ (-shun) the place of meeting or coming together.junc´tional
junction
junction [jungk´shun]
junction (jungk´sh
n),
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.
junc·tion (j ngk sh n)n. 1. The act or process of joining or the condition of being joined. 2. A place where two things join or meet, especially a place where two things come together and one terminates. 3. A transition layer or boundary between two different materials or between physically different regions in a single material. junc tion·al adj. |
junction
[jungk′shən]
Etymology: L, jungere, to join
an interface or meeting place for tissues or structures.
junction [jungk´shun]
a place of meeting or coming together. adj., adj junc´tional.
atrioventricular junction in the conduction system of the heart, the junction between the atrioventricular node and the nonbranching portion of the bundle of His.
cementoenamel junction the line at which the cementum covering the root of a tooth meets the enamel covering the crown.
gap junction a narrowed portion of the intercellular space, containing channels linking adjacent cells and through which can pass ions, most sugars, amino acids, nucleotides, vitamins, hormones, and cyclic AMP. In electrically excitable tissues the gap junctions serve to transmit electrical impulses via ionic currents and are known as electrotonic synapses; they are present in such tissues as myocardial tissue.
myoneural junction (neuromuscular junction) the site of junction of a motor nerve fiber and a skeletal muscle fiber that it innervates. The discoid expansion of the terminal branch of the axon forms the motor end plate, the neurotransmitter that diffuses across the synapse is acetylcholine.
sclerocorneal junction limbus (def. 2).
ureteropelvic junction the area where the renal pelvis meets the ureter.
junction (jungk´sh
n),n a place of coming together, or union.
junction, cementoenamel (CEJ) (cervical line),
n the junction of the enamel of the crown and the cementum of the root of a tooth. The area above the junction corresponds to the anatomic crown of the tooth; the area apical to the junction constitutes the anatomic root of the tooth.
junction, dentinocemental (DCJ),
n the line of union or apposition of the cementum and dentin of a tooth.
junction, dentinoenamel (DEJ) (dentoenamel junction),
n the interface of enamel and dentin of the tooth crown, conforming in a general way to the shape of the crown. Older term is
dentoenamel junction.
dentoenamel junction.
junction, dentoenamel,
n See junction, dentinoenamel.
junction, dentogingival (DGJ),
n the junction between the gingival attachment, a nonkeratinized epithelium, and the tooth surface.
junction, intercellular,
n a special structure that exists between two or more cells with similar functionality. Most of these structures are anchored to the cytoskeleton and therefore provide mechanical stability to tissues. There are several types, including desmosomes that provide stability, tight junctions where the outer membranes of cells have become fused, and gap junctions where adjacent cells exchange cellular material.
junction, mucogingival,
n the scalloped linear area denoting the separation of the gingivae and alveolar mucosa.
junction
the place of meeting or coming together.
cell junction
specialized regions of the cell surface where adjacent eukaryotic cell membranes are joined. Functionally, there are three types: tight junctions (impermeable), gap junctions (communicating) and adhering junctions (desmosomes).
corneoscleral junction
costochondral junction
the joint between the bony dorsal part of a rib and the ventral cartilaginous part.
ileocecocolic junction
the T-junction between the ileum and the large intestine; in the cat the ileum and the colon merge end to end, the cecum enters from the side; in the horse the ileocecal and the cecocolic junctions are separated from each other.
mucocutaneous junction
see mucocutaneous margin.
neuromuscular junction
see neuromuscular junction.
sclerocorneal junction
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