commissura posterior

(redirected from commissura epithalamica)

com·mis·sur·a pos·te·ri·or

[TA]
a thin band of white matter, crossing from side to side beneath the habenula of the pineal body and over the aditus ad aqueductum cerebri; it is largely composed of fibers interconnecting the left and right pretectal region and related cell groups of the midbrain; it marks the junction of the diencephalon and mesencephalon.