(redirected from Commissures)
Also found in: Dictionary, Thesaurus, Medical.


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 ?
A tear may be occurring anywhere in the mitral valve, in leaflets and commissures during the CMV operation.
Revision and further deepening of the commissures are often necessary during the teenage years.
The unicommissural valve, which constitutes most of the unicuspid valves, has one commissure and usually two other rudimentary commissures (raphae) and a vertical orifice extending from the only true commissure (Figures 1 and 2) (9).
intercostal areas; transverse commissures abundant, closely arranged,
The majority of GABA-ir axonal processes extend into the connectives and commissures of the ganglia, implying an important central integrative role of GABA-ir neurons (Hernadi 1994, Diaz-Rios et al.
However, the occipital cross commissures (occ) continue in Eukaia almost to the middle of the Nu plate as in Actinolepis (Mark-Kurik 1973, text-fig.
Well-concentrated, connectives and commissures indistinct; total nerve ring volume ~1/20 of haemocoel.
During this time the cerebral cortex, basal ganglia and anterior commissure are formed.
Venation pattern pinnate; leaf axis distinct; midvein not distinct from other longitudinal veins; veins convergent at apex; transverse commissures widely separated from each other, connected to longitudinal veins.
Mean Orifice values of the distances between the coronary orifices and the commissures of the aortic leaflets according to gender and age Commissure to Mean distance, mm Male (Age, years) 29-40 41-60 Left Left 12.
The first day the nestling had black down on the head, back, rump, shoulder, and flanks, the skin color was a pale yellow, the eyes were closed, the commissures were yellow, and the tip of the bill was black.