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Tetrachromatic color vision
Tetrachromatic color vision Color vision based on four cone photoreceptor pigments in the retina. The fourth cone type is sensitive to U.V. light and seen in goldfish.
RELATED TERMS--------------------------------------
Vision
The sense of sight.
Cone
One of the two light receiving retinal cells (the other is the rod) that is responsible for daylight vision (e.g., color vision, high visual acuity, bright light vision). The area of the retina that provides central or reading vision, known as the fovea, contains only cones.
Photoreceptor
A light sensitive neuron. Photoreceptors interact with light which produces changes in their electrical properties which are communicated to other neurons. They constitute the first stage in the physiological process which underlies vision. The human retina, like the retina of most vertebrates, contains two broad classes of photo-receptors, rods and cones.
Retina
A membrane lining the inside of the back of the eye that contains light-sensitive nerve cells that convert focused light into nerve impulses, making vision possible.
SIMILAR TERMS--------------------------------------
Tetrachel
Tetrachel is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): tetracycline hydrochloride.
Tetracycline
Tetracycline is an antibiotic produced by the streptomyces bacterium, indicated for use against many bacterial infections.
Tetracycline hcl
Tetracycline hcl is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): tetracycline hydrochloride.
Tetracyn
Tetracyn is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): procaine hydrochloride; tetracycline hydrochloride.
Tetramed
Tetramed is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): tetracycline hydrochloride.
Tetraplegia
Paralysis of all four extremities only. Another term for quadriplegia.
Tetrex
Tetrex is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): tetracycline phosphate complex.
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Tapetum
Silvery lining behind the retina in some animals active in dim light. Reflects light back through the eye and allows the photoreceptors a second chance to absorb photons.
Tectopontine tract
Relays information from the colliculus to the cerebellum for further coordination of eye and head movement.
Tectospinal tract
Axons from the colliculus to the upper spinal cord where the neck motor neurons are located. Involved in reflex control of head and neck movements.
Template matching
An object recognition method. Incoming patterns are matched against a set of templates. If there is sufficient overlap between object and template, a match is signaled. Of limited use, primarily in alphanumeric character recognition.
Temporal hemiretina
That portion of the retina that lies lateral to the fovea.
Tetrachromatic color vision
Texton
The basic textural elements of pre-attentive vision such as elongated blobs or line segments and their terminators which are important for segregation of textures.
Transducin
A regulatory g-protein in photoreceptors which stimulates phosphodiesterase molecules and acts as an amplifier of the incoming light signal.
Thoracentesis
Puncture of the pleural cavity.
Thrombocytopenia
Decrease in blood platelets.
Thromboembolus
A clot of material that breaks free from a primary site, is transported in the bloodstream and becomes lodged and adhered at a secondary site.
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