decussation


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Related to decussation: decussation of pyramids

dec·us·sa·tion

 (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•tion

(ˌdi kəˈseɪ ʃən, ˌdɛk ə-)

n.
1. an instance of crossing or the condition of being crossed in the form of an X.
2. a nerve or tract of nerve fibers that crosses from one side of the central nervous system to the other.
[1650–60]

decussation

the state of being in the form of an X. See also joining.
See also: Form
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.decussation - an intersection or crossing of two tracts in the form of the letter X
anatomical structure, bodily structure, body structure, complex body part, structure - a particular complex anatomical part of a living thing; "he has good bone structure"
chiasma opticum, optic chiasm, optic chiasma - the crossing of the optic nerves from the two eyes at the base of the brain
Translations

de·cus·sa·tion

n. decusación, cruzamiento de estructuras en forma de X;
___ of pyramids___ de las pirámides, cruzamiento de fibras nerviosas de una pirámide a otra en la médula oblongata;
optic ______ óptica, cruzamiento de las fibras del nervio óptico.
References in periodicals archive ?
During development, decreased melanin synthesis in the retinal pigment epithelium results in foveal hypoplasia and dysregulation of adjacent retinal ganglion cells, and consequently, misrouted decussation of the nerve fibres connecting the retina to the brain at the optic chiasm.
1) This appearance is a result of absence or hypoplasia of the cerebellar vermis, lack of normal dorsal decussation and consequent enlargement of the superior cerebellar peduncles which follow a more horizontal course as they extend perpendicularly to the brainstem between the midbrain and the cerebellum.
This means that unilateral pyramidal tract lesions above the point of decussation in the pyramids will cause paralysis of the muscles served by the spinal nerves on the opposite side of the body.