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chiasm

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chiasm /chi·asm/ (ki´azm) a decussation or X-shaped crossing.
optic chiasm  the structure in the forebrain formed by the decussation of the fibers of the optic nerve from each half of each retina.

chiasm
[kī′azəm]
Etymology: Gk, chiasma, lines that cross
1 the crossing of two lines or tracts, as of the optic nerves at the optic chiasm.
2 (in genetics) the crossing of two chromatids in the prophase of meiosis. chiasmal, chiasmic, adj.

chiasm [ki´azm]
a decussation or X-shaped crossing.
optic chiasm a structure in the forebrain formed by the decussation of fibers of the optic nerve from each half of each retina.

chiasm
a decussation or Y-shaped crossing.

optic chiasm
a structure in the forebrain formed by the decussation of fibers of the optic nerve from each half of each retina.


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Patients may have symptoms due to compression of adjacent structures, particularly the optic chiasm and optic nerves.
The etiologies of their visual impairments included retinopathy of prematurity, glaucoma, retinal detachment, amaurosis, optic chiasm tumors, sarcoid growth, injury, retinitis pigmentosa, diabetic retinopathy, retinal blastoma, macular degeneration, and unknown.
Circling Zero is particularly reminiscent of Maurice Merleau-Ponty's ideas about horizonal interactions, and the relationships between figure and ground discussed so beautifully in his The Intertwining--The Chiasm (1968).
 
 
 
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