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commissure (komĀ“ĭ-shәr)   a site of union of corresponding parts, such as the angle of the lips or eyelids.
  the site of junction between adjacent cusps of a cardiac valve.
 

anterior commissure  the band of fibers connecting the parts of the two cerebral hemispheres.

commissure of epithalamus  a large fiber bundle that crosses the midline of the epithalamus just dorsal to the point where the cerebral aqueduct opens into the third ventricle.

middle commissure  a band of gray matter joining the optic thalami; it develops as a secondary adhesion and may be absent.

posterior commissure  commissure of epithalamus.





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