Britannica
Sources used in this answer
- optic nerve
- human eye - The retina
- eye disease - Disorders of the optic nerve
- nervous system disease - Optic nerve
- human eye - Fusion of retinal images
- human eye - Striate area
- human nervous system - Optic nerve (CN II or 2)
- photoreception - Neural transmission
- photoreception - Central processing of visual information
- human eye - Rhodopsin
How does the optic nerve transmit visual signals from the human eye to the brain?
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human eye
A horizontal cross section of the human eye, showing the major parts of the eye, including the protective covering of the cornea over the front of the eye.
The optic nerve, the second cranial nerve, transmits visual signals from the retina to the brain. It is formed by the axons of ganglion cells in the retina, which converge at the optic disk and exit the eye. These nerve fibers travel through the optic chiasm, where approximately half of them cross to the opposite side of the brain, enabling binocular vision. The remaining fibers continue in optic tracts to various brain centers, primarily the lateral geniculate nuclei, and then to the visual cortex in the occipital lobes for processing. Some fibers also connect to the brainstem to regulate pupil size. This intricate pathway allows the brain to interpret visual information, creating our perception of the world.12345