decussation (redirected from fountain decussation of Meynert)

decussation /de·cus·sa·tion/ (-sa´shun) a crossing over; the intercrossing of fellow parts or structures in the form of an X.

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Forel's decussation  the ventral tegmental decussation of the rubrospinal and rubroreticular tracts in the mesencephalon.

fountain decussation of Meynert  the dorsal tegmental decussation of the tectospinal tract in the mesencephalon.

pyramidal decussation  the anterior part of the lower medulla oblongata in which most of the fibers of the pyramids intersect.

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dec·us·sa·tion (dk-sshn, dk-)

n.

1. A crossing in the shape of an X.

2. An X-shaped crossing, especially of homonymous nerves or bands of nerve fibers, connecting corresponding parts on opposite sides of the brain or spinal cord.

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decussation

a crossing over; the intercrossing of fellow parts or structures especially in the form of a Y.

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decussation of pyramids

the anterior part of the lower medulla oblongata in which some of the fibers of each pyramid intersect as they cross the midline and descend as the lateral corticospinal tracts.