decussation of pyramids

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Etymology: L, decussare, to make a cross; Gk, pyramis

the crossing of nerve fibers of the corticospinal motor tract at the ventral side on the lower portion of the medulla oblongata.

decussation [de″kus-sa´shun]

a crossing over; the intercrossing of fellow parts or structures in the form of an X.

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

decussation

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

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.

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