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Ocellus
Ocellus Eye-Cup. A patch of light-sensitive receptor cells sunk into the skin present in some species.
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Receptor
A molecule that recognizes a unique hormone. Once that hormone is bound to the receptor, the information carried by the hormone can now exert its biological action.
Skin
Skin is an organ of the integumentary system; which is composed of a layer of tissues that protect underlying muscles and organs. Skin is used for insulation, vitamin D production, sensation, and excretion (through sweat).
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Orchitis
Inflammation of the testes in association with an infection, such as mumps.
Orthopedic disabilities
A physical condition which affects mobility and development of motor skills.
Otitis media
The most common reason sick infants visit the doctor, otitis media (earinfection) is caused by bacteria breeding in excess fluid in the middle ear. Most ear infections begin during or shortly after an infant has a cold.
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
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
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.
Opsin
Protein portion of rhodopsin.
Opthalmoscope
Device for seeing light reflected from the interior of the eye. First built by Hermann von Helmholtz.
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