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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.


(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


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


(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


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

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.


(jŭngk'shŭn) [TA]
The point, line, or surface of union of two parts, mainly bones or cartilages.
References in periodicals archive ?
NextWednesday, August 7, will involved the closure of the M80 southbound from the M73/M80 diverge to Junction 3 Hornshill, as well as the M80 southbound on-slip Junction 4 Westfield.
| Penarth Road, from its junction with Saunders Road to the entrance leading to the rear of Cardiff Central railway station.
| The roads closed from 10am until 3.10pm tomorrow - Colum Road Park Place from the junction with St Andrews Place to the junction with Colum Road.
At the same time, a lane was closed southbound on the same stretch of motorway when a brokendown vehicle brought traffic to a halt and queues stretched back to junction 8 until the road was cleared.
The length of the westbound carriageway of the trunk road that extends from the nosing of the westbound exit slip road at Junction 33 (Northop) to the nosing of the westbound exit slip road at Junction 31 (Caerwys).
In 2012, Junction introduced the JXN Executive Roundtable, a series of events focused on bringing together thought leadership and promoting collaboration in the business community.
A MONSTER IN PARIS (U) Llandudno Junction Cineworld (Sun) ALVIN AND THE CHIPMUNKS: CHIPWRECKED (U) The chipmunks are stranded on an island and go back to nature.
If you are planning to travel by road on the last day of the holiday weekend, the AA has offered this list of traffic hotspots: n M42 southbound n A303 westbound n M5 westbound n M6 southbound n M25 between junctions 12-17 and junction 27 n Channel Tunnel and Ferry ports n M1 northbound n M6 Toll n M56 westbound n M6 northbound from junction 30 With roadworks remaining in place on: n M1 northbound - Junction 6a-9 n A3 Hindhead n M27 junction 3-4
In the September Nature Materials, Bandaru and his coworkers report that a Y junction can do the same in a much smaller space than its non-branching cousin can.
Less than a mile from the Secaucus Junction transfer station via shuttle bus, 333 Meadowlands Parkway will additionally be served by the New Jersey Turnpike's 15X interchange, currently under construction.
Death Valley Junction is a destination, but it isn't a town, exactly--it's a hotel, a theater shadowed by some adobe houses, and a pair of abandoned buildings standing by the side of a two-lane road in Death Valley.