Written by Pam MS, NCSP | Fact checked by Psychology Dictionary staff 

a big group of nerve fibers within the brain which passes over the midline of the epithalamus just dorsal to the place where the cerebral aqueduct opens into the fourth ventricle. It is made up mainly of myelinated fibers linking oculomotor and corresponding cells of the midbrain.

POSTERIOR COMMISSURE: "The posterior commissure was partially severed during the accident."

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