optic decussation


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op·tic chi·asm

[TA]
a flattened quadrangular body in front of the tuber cinereum and infundibulum, the point of crossing or decussation of the axons of the optic nerves. Axons from the nasal retina cross to the opposite side, whereas axons from the temporal retina run directly caudal without crossing; some pass transversely on the posterior surface between the two optic tracts, and others pass transversely on the anterior surface between the two optic nerves.

op·tic chi·asm

(op'tik kī'azm) [TA]
A flattened quadrangular body in front of the tuber cinereum and infundibulum, the point of crossing or decussation of the fibers of the optic nerves; most of the fibers cross to the opposite side, some run directly forward on each side without crossing, some pass transversely on the posterior surface between the two optic tracts and others pass transversely on the anterior surface between the two optic nerves.
Synonym(s): optic decussation.

optic decussation

The crossing of 50% of the nasal retinal ganglion cell axons in the optic nerves, just in front of the pituitary stalk.
Synonym: optic chiasm See: optic tract
See also: decussation

op·tic chi·asm

(op'tik kī'azm) [TA]
A flattened quadrangular body in front of the tuber cinereum and infundibulum, the point of crossing or decussation of the fibers of the optic nerves.
Synonym(s): optic decussation
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