How the Body Works : The Visual Mechanism

The Visual Mechanism

This cross section of a brain, as viewed from above, shows how the image which reaches the retina is coded and relayed to the visual cortex. Light falling on the retina stimulates the fibers of the optic nerve. These fibers join to form a cross, called the optic chiasma, where fibers from the inner side of each eye pass to the visual cortex on the opposite side. Fibers from the outer field of each eye are uncrossed, passing to the visual cortex on the same side. From the optic chiasma, the information passes, via the optic tracts, to the lateral geniculate bodies, where perception of depth occurs, and then onto the optic radiation, which transmits the information to the primary visual cortex, situated in the occipital lobes. The primary visual cortex is responsible for the perception of the position of objects in space, and their relationship to each other, as well as the perception of light and shade. In this way, an overall composite picture of any object is formed.

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[formceo]

binocular visual processing does not occur at the LGN level - the LGN neurons are still monocular. The visual cortex (V1) is the first location along the visual pathway to combine monocular input for binocular processing.

[xJaysrox]

its not in the LGN that makes 3D images... it happens in IVC in V1 where the information of both eyes go together!

[magzdookie33]

yup it does look like a vagina of an 86 year old woman...

[maddog937]

its a vagina...

[RevengeOfTheAbyss]

Ahh, the left/right visual field, of each eye, not the vision through left or right eyes in totality.

[Urustu]

The information split at the optic chiasm does not take place according to medial and lateral fields - it occurs via left/right. Yes, left and right can be regarded as medial and lateral, but the split of visual information takes place as follows: the information from the left visual field of each eye is sent to the right visual cortex, and the information from the right visual field of each eye is sent to the left visual cortex.

[MickBReedy]

the nasal retina crosses through the lateral geniculate nucleus

[tonyballa07]

stimulates the fibers where they join across?