Optic Chiasm
The optic chiasm is the 2nd of the 12 cranial nerves. It controls the optic sensory vision information. Each eyeball has an optic nerve which crosses over each other at the bony optic canal to emerge intracranially on the underside front of the brain. At this point, the optic nerve from each eye comes together and forms an “X”.
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Optic Chiasm
The Visual Pathway:
The fibers from the nasal halves of each retina cross to the opposite side of the brain, while those from the temporal halves remain uncrossed.
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This partial decussation is called the chiasma.
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The optic nerves after this point are called the optic tract.
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They contain nerve fibers from both retinas.
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A decussation is any crossing of nerve fibers that forms an “X”, especially bands of nerve fibers across the spinal column.
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