junction
(jŭngk'shŏn 
)
[L. junctio, stem junction-, a joining]
The place of union or coming together of two parts or tissue layers.
amelodentinal j.Dentinoenamel junction.
atrioventricular j.The area of cardiac conduction pathway connecting the AV node with the atrioventricular bundle.
cementodentinal j.The interface of dentin and cementum of the tooth. SYN: dentinocemental junction.
cementoenamel j.The line around the tooth that marks the boundary between the crown and root of the tooth; the interface between enamel and cementum.
cervicomedullary j.The nexus between the most superior part of the spinal cord and the medulla oblongata of the brainstem.
costochondral j.The articulation or meeting place of the bony rib and its costal cartilage.
dentinocemental j.Cementodentinal junction.
dentinoenamel j.The plane or interface between the dentin of the tooth and the enamel crown. It is a scalloped border at the site of the basement membrane that separates the cell layers that formed the calcified enamel and dentin. SYN: amelodentinal junction.
dentogingival j.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.
liquid j.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 j.The junction between the skin and a mucous membrane.
mucogingival j.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. SYN: mucogingival line.
myoneural j.The axon terminal of a motor neuron, synaptic cleft, and sarcolemma of a muscle cell. SYN: neuromuscular junction.
SEE: illus.
neuromuscular j.Myoneural junction.
saphenofemoral j.The merging of the saphenous and femoral veins in the inguinal region.
sclerocorneal j.The meeting point between the sclera and the cornea marked on the external surface of the eyeball by the outer scleral sulcus.
squamocolumnar j.1The 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.2The point above the lower esophageal sphincter where the squamous epithelium of the esophagus and the columnar epithelium of the stomach meet. SYN: transition zone..
SEE: illus.
tight j.A part of the junctional complex at the lateral interface between epithelial cells; also called zonula occludens.
uteropelvic j.The anatomical funnel that directs urine from the renal pelvis into the ureter.