The lateral geniculate nucleus (LGN) of the
thalamus is a part of the
brain, which is the primary processor of visual information, received from the
retina, in the
central nervous system.The LGN receives information directly from the retina, and sends projections directly to the
primary visual cortex. In addition, it receives many strong feedback connections from the primary visual cortex.
Ganglion cells of the retina send
axons to the LGN through the
optic nerve. Although it is generally considered to be a
cranial nerve, and is always listed as cranial nerve II, in reality the retina and optic nerve arise as an outpocketing of the developing
diencephalon. Rather than a proper nerve, then, the optic nerve is really a
tract of the brain.
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