|
 |
||
 |
| This glossary contains: 19186 medical terms |
 |
Opsin
|
|
Opsin Protein portion of rhodopsin.
RELATED TERMS--------------------------------------
Protein
Any of a group of complex organic compounds which contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur, the characteristic element being nitrogen. Proteins, the principal constituents of the protoplasm of all cells, are of high molecular weight and consist essentially of combinations of a-amino acids in peptide linkages. Twenty different amino acids are commonly found in proteins, and each protein has a unique genetically defined amino acid sequence which determines its specific shape and function. Their roles include enzymatic catalysis, transport and storage, coordinated motion, nerve impulse generation and many others.
Rhodopsin
The visual pigment in rod cells. Contains opsin and retinal.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
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
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
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.
Optic radiations
Projections from LGN to primary visual cortex (V1).
RELATED TERMS--------------------------------------
Protein
Any of a group of complex organic compounds which contain carbon, hydrogen, oxygen, nitrogen, and usually sulfur, the characteristic element being nitrogen. Proteins, the principal constituents of the protoplasm of all cells, are of high molecular weight and consist essentially of combinations of a-amino acids in peptide linkages. Twenty different amino acids are commonly found in proteins, and each protein has a unique genetically defined amino acid sequence which determines its specific shape and function. Their roles include enzymatic catalysis, transport and storage, coordinated motion, nerve impulse generation and many others.
Rhodopsin
The visual pigment in rod cells. Contains opsin and retinal.
SIMILAR TERMS--------------------------------------
PREVIOUS AND NEXT TERMS--------------------------------------
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
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
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.
Optic radiations
Projections from LGN to primary visual cortex (V1).
We thank you for using the Medical Glossary to search for Opsin. If you have a better definition for Opsin than the one presented here, please let us know by making use of the suggest a term option. This definition of Opsin may be disputed by other professionals. Our attempt is to provide easy definitions on Opsin and any other medical topic for the public at large.
This dictionary contains 19186 terms.
|
|