| cardioesophageal junction | The abrupt transition from oesophageal mucosa to that of the cardiac portion of stomach, demarcated internally in the living by the z-line, and approximated externally by the cardiac notch. (05 Mar 2000) |
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| gap junction | <cell biology> A junction between two cells consisting of many pores that allow the passage of molecules up to about 900D. Each pore is formed by an hexagonal array (connexon) of six transmembrane proteins (connexins) in each plasma membrane: when mated together the pores open, allowing communication and the interchange of metabolites between cells. Electrical synapses are gap junctions and metabolic cooperation depends upon the formation of gap junctions. (18 Nov 1997) |
| manubriosternal junction | The angle between the manubrium and the body of the sternum at the manubriosternal junction. Marks the level of the second costal cartilage (rib) for counting ribs or intercostal spaces. Denotes level of aortic arch, bifurcation of trachea, and T4/T5 intervertebral disc. Synonym: angulus sterni, Louis' angle, Ludwig's angle, manubriosternal junction. (05 Mar 2000) |
| rectosigmoid junction | <anatomy> The site where the sigmoid colon becomes the rectum; usually takes the form of an acute angle, demarcated externally by a discontinuation of appendices epiploicae, a spreading out of the teniae coli to completely encircle the rectum, and consequently, termination of the sacculations (haustrae) between the teniae. (05 Mar 2000) |
| cell junction | <cell biology> Specialised junctions between cells. See: adherens junctions, desmosomes, tight junctions, gap junctions. (26 Mar 1998) |
| cementodentinal junction | <dentistry> The surface at which the cementum and dentin of the root of a tooth are joined. Synonym: dentinocemental junction. (05 Mar 2000) |
| cementoenamel junction | <dentistry> The surface at which the enamel of the crown and the cementum of the root of a tooth are joined. See: cervical line. (05 Mar 2000) |
| right splicing junction | Boundary between the right end of an intron and the left end of the adjacent exon. Synonym: acceptor splicing site. (05 Mar 2000) |
| choledochoduodenal junction | That part of the duodenal wall traversed by the ductus choledochus, ductus pancreaticus, and ampulla. (05 Mar 2000) |
| communicating junction | <cell biology> Another name for a gap junction. (05 Jan 1998) |
| mucocutaneous junction | The site of transition from epidermis to the epithelium of a mucous membrane. (05 Mar 2000) |
| muscle-tendon junction | The union of a muscle and tendon fibre in which sarcolemma intervenes between the two; the end of the muscle fibre may be rounded, conical, or tapered. Synonym: muscle-tendon junction. (05 Mar 2000) |
| costochondral junction | <anatomy> The point where the ribs articulate with the sternum (cartilaginous articulation). (10 Nov 1998) |
| myoneural junction | The synaptic connection of the axon of the motor neuron with a muscle fibre. See: motor endplate. Synonym: neuromuscular junction. (05 Mar 2000) |
| posterior junction line | Radiographic image of the mediastinal septum between the upper lobes behind the oesophagus, above the aortic arch. (05 Mar 2000) |