decussation


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Related to decussation: decussation of pyramids

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.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

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)]
Farlex Partner Medical Dictionary © Farlex 2012

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.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

decussation

A crossing so as to form an X, especially of tracts of nerve fibres.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

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.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann
References in periodicals archive ?
decussation to be the proliferating network of the universe.
Rakic, "Patterns of decussation of bulbar pyramids and distribution of pyramidal tracts on two sides of the spinal cord," Transactions in American Neurology Association, vol.
This is because of complete decussation of the optic nerve fibers at the optic chiasm and then again between the pretectal nucleus and the parasympathetic nucleus of cranial nerve III.
[21] A modest number of the tectal fibres decussate through supraoptic decussation to reach the contralateral rotundus [22]; this input may consist of collaterals of the ipsilateral tectorotundal fibres.
Optic chiasma: Partial decussation of human retinal axons takes place in optic chiasma.
Central paralyses occur when the lesion disrupts the facial nerve fibers prior to their decussation in the reticular formation of the caudal pons.
This is because birds, unlike mammals, have complete decussation of the optic nerve fibers at the optic chiasm to the contralateral area pretectalis.