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Off-Center cells
Off-Center cells Decrease their activity when light increments are presented in their receptive fields. Surrounded by an antagonistic region which responds with the opposite polarity. Both ganglion and bipolar cells are separated into two classes, on-center and off-center. The off-center cells have dendrites that branch in the outer portion of the inner plexiform layer. See also On-Center Cells.
RELATED TERMS--------------------------------------
Ganglion
A cluster of nerve cells.
Dendrites
Extensions of the nerve cell body. They are short and branched and receive stimuli from other NEURONS.
SIMILAR TERMS--------------------------------------
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Otolaryngologist
A physician who specializes in the treatment of the ears, nose, and throat.
Object centered coordinate system
A structural description of an object independent of viewpoint.
Ocellus
Eye-Cup. A patch of light-sensitive receptor cells sunk into the skin present in some species.
Ocular dominance columns
The primary visual cortex (V1) is organized into alternating columns sensitive to input from the left and right eyes.
On-Center cells
Increase their activity when light increments are presented in their receptive files. Surrounded by an antagonistic region which responds with the opposite polarity. Both ganglion and bipolar cells are separated into two classes, on-center and off-center. The on-center cells have dendrites that branch in the inner portion of the inner plexiform layer. See also Off-Center Cells.
Off-Center cells
Opsin
Protein portion of rhodopsin.
Opthalmoscope
Device for seeing light reflected from the interior of the eye. First built by Hermann von Helmholtz.
Optic chiasm
Location where the optic nerve axons from the two retinae join and are reorganized into two separate groups (the optic tracts) that encode information about the right and left visual fields.
Optic disk
Where the ganglion cell axon fibers leave the retina. Contains no photoreceptors and therefore creates a blind spot in the visual field.
Optic nerves
Myelinated axons from the optic disk of each eye which join at the optic chiasm.
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