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A joint, seam, or closure line where two structures unite.



in human and animal anatomy, a site of union or junction.

The commisura labiorum oris is the junction of the lips at the corners of the mouth. The anterior commissure of the cerebrum is the transverse bundle of nerve fibers that unites the corpora striata of the forebrain in the majority of vertebrates. The anterior commissure of the mantle, or the commissura fornicis, joins the hemispheres of the forebrain in dipnoans and terrestrial vertebrates—the basis of the corpus callosum in mammals.

References in periodicals archive ?
2000) in having (1) less transverse commissural outline, (2) a more strongly convex ventral valve, (3) almost straight sagittal profile of the anterior and posterior slopes and maximum height at the umbo, (4) a more prominent, narrow subtriangular apical process, (5) large, but weakly impressed cardinal muscle fields and (6) indiscernible dorsal central muscle scars.
Netrin-1 is required for commissural axon guidance in the developing vertebrate nervous system.
3; paired ovules, not attached to the parent plant, with exposed one or two commissural ribs in the distal part.
2 [micro]m height, triradiate and commissural ridges straight and smooth, ultrastructure fibrous.
In 1929, Pike and colleagues observed spontaneous hind limb recovery after spinal cord hemisection in cats and proposed that "the mechanism which takes over control of movements of the limb lying below the level of the lesion includes motor fibers coming down on the opposite side of the spinal cord, and commissural neurons lying in the spinal cord below the level of the lesion" [21].
Diffusion tensor imaging tractography applied in normal volunteers is able to resolve normal supratentorial fiber tracts (including various association fibers, projection fibers, and commissural fibers).
Also, the PCRF is traversed by an extensive system of commissural fibers that interconnect the vestibular nuclear complexes.
Aortic stenosis presenting in adulthood usually is due to immobilization of the aortic valvular cusps by calcific deposits with little or no commissural fusion.
Rheumatic heart disease is characterized by gross commissural fusion, leaflet thickening, and fusion of chordae.
A coronary artery ostium located at the lower end of the coronary sinus is named as low coronary artery ostium and an ostium located within 5 mm of the aortic valve apposition at the aortic annulus is called as commissural coronary artery ostium (20).
Commissural size in neonatal rats: Effects of sex and prenatal alcohol exposure.