Chapter 10: The Central Visual System

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25 Jan 2012
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The retinofugal projection y the neural pathway that leaves the eye, beginning with the optic nerve is often referred to as the retinofugal projection. The optic nerve, optic chiasm, and optic tract y the ganglion cell axons fleeing the retina pass through three structures before they form synapses in the brain stem. Left visual hemifield is viewed by the right hemisphere and vice versa because the optic nerves cross in the optic chiasm. Lesions anywhere in the retinofugal projection form eye to lgn to visual cortex cause blindness in humans: this pathway therefore mediates conscious visual perception y visual field deficits from lesions in the retinofugal projection. If the optic nerve on the left side is cut, vision will be lost completely in the left eye. The right eye still sees portion of the left visual field. If the optic tract on the left side is cut, vision will be lost in the right visual field of each eye.

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