junction

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Related to adherent junction: Adhering junction, hemidesmosome, Desmosomes, Gap junctions, Tight junctions

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.

junc·tion

(jŭngk'shŭn), [TA]
The point, line, or surface of union of two parts, mainly bones or cartilages. Synonym(s): juncture (2)
Synonym(s): junctura (2) [TA], junctio

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.
Enlarge picture
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.

junction

[jungk′shən]
Etymology: L, jungere, to join
an interface or meeting place for tissues or structures.

junc·tion

(jŭngk'shŭn) [TA]
The point, line, or surface of union of two parts, mainly bones or cartilages.
Synonym(s): junctio.

junction

(junk'shun) [L. junctio, a joining]
The place of union or coming together of two parts or tissue layers.

amelodentinal junction

Dentinoenamel junction.

atrioventricular junction

The area of cardiac conduction pathway connecting the AV node with the atrioventricular bundle.

cementodentinal junction

The interface of dentin and cementum of the tooth. Synonym: dentinocemental junction

cementoenamel junction

The line around the tooth that marks the boundary between the crown and root of the tooth; the interface between enamel and cementum.

costochondral junction

The articulation or meeting place of the bony rib and its costal cartilage.

cervicomedullary junction

The nexus between the most superior part of the spinal cord and the medulla oblongata of the brainstem.

dentinocemental junction

Cementodentinal junction.

dentinoenamel junction

The plane or interface between the dentin of the tooth and the enamel crown; histological sections show it to be a scalloped boundary at the site of the basement membrane which separated the cell layers that formed the calcified enamel and dentin. Synonym: amelodentinal junction

dentogingival junction

The interface and zone of attachment between the gingiva and enamel or cementum of the tooth. It holds in place the junctional or attachment epithelium.

interneuronal junction

Synapse.

liquid junction

The point in a potentiometric reference electrode measurement system at which the reference solution makes contact with the test solution. An example is pH reference electrode.

mucocutaneous junction

The junction between the skin and a mucous membrane.

mucogingival junction

A scalloped, indistinct boundary between the gingiva and the oral mucosa on the alveolar process. The coral color of gingiva may be contrasted with the more vascular oral mucosa. Also called the mucogingival line.
Enlarge picture
MYONEURAL JUNCTION

myoneural junction

The axon terminal of a motor neuron, synaptic cleft, and sarcolemma of a muscle cell. Synonym: neuromuscular junction
See: illustration

neuromuscular junction

Myoneural junction.

saphenofemoral junction

The merging of the saphenous and femoral veins in the inguinal region.

sclerocorneal junction

The meeting point between the sclera and the cornea marked on the external surface of the eyeball by the outer scleral sulcus.
Enlarge picture
SQUAMOCOLUMNAR JUNCTION: Squamocolumnar junction of the distal esophagus (seen endoscopically)

squamocolumnar junction

1. The point in the cervical canal at which the squamous and columnar epithelia meet. As most cervical cancers begin in this area, it is important to obtain cells from this location for the Pap test.
2. The point above the lower esophageal sphincter where the squamous epithelium of the esophagus and the columnar epithelium of the stomach meet.
Synonym: transition zone. See: illustration

tight junction

A part of the junctional complex at the lateral interface between epithelial cells; also called zonula occludens.

junc·tion

(jŭngk'shŭn) [TA]
The point, line, or surface of union of two parts, mainly bones or cartilages.

junction (jungk´shən),

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.
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
see 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
see corneoscleral junction.