decussation

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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.

de·cus·sa·ti·o

, pl.

de·cus·sa·ti·o·nes

(dē'kŭ-sā'shē-ō, -ō'nēz), [TA]
1. In general, any crossing over or intersection of parts.
2. The intercrossing of two homonymous fiber bundles as each crosses over to the opposite side of the brain in the course of its ascent or descent through the brainstem or spinal cord.
Synonym(s): decussation
[L. (see decussate)]

decussation

(dĕk′ə-sā′shən, dē′kə-)
n.
1. A crossing in the shape of an X.
2. Anatomy An X-shaped crossing, especially of nerves or bands of nerve fibers, connecting corresponding parts on opposite sides of the brain or spinal cord.

de·cus·sa·ti·o

, pl. decussationes (dē'kŭ-sā'shē-ō, -nēz) [TA]
1. In general, any crossing over or intersection of parts.
2. The intercrossing of two homonymous fiber bundles as each crosses over to the opposite side of the brain in the course of its ascent or descent through the brainstem or spinal cord.
Synonym(s): decussation.

decussation

A crossing so as to form an X, especially of tracts of nerve fibres.

decussation

Crossing of nerve fibres passing through the mid-sagittal plane of the central nervous system and connecting with structures on the opposite side. Partial decussation occurs at the optic chiasma.