commissure /com·mis·sure/ (kom´ĭ-shoor) a site of union of corresponding parts; specifically, the sites of junction between adjacent cusps of the heart valves.commis´sural
commissure
commissure (k
mish´ur),
anterior commissure the band of fibers connecting the parts of the two cerebral hemispheres.
posterior commissure a large fiber bundle crossing from one side of the cerebrum to the other, dorsal to where the aqueduct opens into the third ventricle.
Gudden's commissure see supraoptic c's.
Meynert's commissure see supraoptic c's.
supraoptic commissures commissural fibers crossing the midline of the human brain dorsal to the caudal border of the optic chiasm, representing the combined commissures of Gudden and Meynert.
com·mis·sure (k m  -sh r )n. 1. A line or place at which two things are joined. 2. A tract of nerve fibers passing from one side to the other of the spinal cord or brain. 3. The point, angle, or surface where two parts, such as the eyelids, lips, or cardiac valves, join or connect. com mis·sural adj. |
commissure
[kom′isoo͡r, -syoo͡r]
1 a band of nerve fiber or other tissue that crosses from one side of the body to the other, usually connecting two structures or masses of tissue.
2 a site of union of two anatomic parts, as the corner of the eye, lips, or labia.
commissure (k
mish´ur),n the corners of the oral cavity.
commissure, commissura
a site of union of corresponding parts, as the angle of the lips or eyelids; used also with specific reference to the sites of junction between adjacent cusps of the heart valves.
brain commissure
the bands of fibers connecting the parts of the two cerebral hemispheres. They include the corpus callosum, the largest commissure, a rostral commissure which is part of the paleopallium and the fornical commissure which is related to the archipallium, the caudal collicular commissure which connects the caudal colliculi (corpora quadrigemina). Called also cerebral commissure.
cerebral commissure
see brain commissure (above).
fornical commissure
interconnection between the right and left hippocampi. Called also fornical commissure.
habenular commissure
interconnection between the right and left habenular nuclei.
middle commissure
a band of gray matter joining the optic thalami; it develops as a secondary adhesion and may be absent.
posterior commissure
a large fiber bundle crossing from one side of the cerebrum to the other dorsal to where the aqueduct opens into the third ventricle.
spinal cord commissure
the gray and white commissures which connect the two sides of the spinal cord.
commissure
Band of nerve fibres connecting corresponding structures in the brain or spinal cord. See corpus callosum.
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