visual cortex (redirected from Visual area V4)

cortex /cor·tex/ (kor´teks) pl. cor´tices   [L.] the outer layer of an organ or other structure, as distinguished from its inner substance.cor´tical

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adrenal cortex  the outer, firm layer comprising the larger part of the adrenal gland; it secretes many steroid hormones including mineralocorticoids, glucocorticoids, androgens, 17-ketosteroids, and progestins.

cerebellar cortex , cortex cerebella´ris the superficial gray matter of the cerebellum.

cerebral cortex , cortex cerebra´lis the convoluted layer of gray substance covering each cerebral hemisphere; see archicortex, paleocortex, and neocortex.

cortex len´tis  the softer, external part of the lens of the eye.

motor cortex  see under area.

provisional cortex  the cortex of the fetal adrenal gland that undergoes involution in early fetal life.

renal cortex , cortex re´nis the outer part of the substance of the kidney, composed mainly of glomeruli and convoluted tubules.

striate cortex  the part of the occipital lobe of the cerebral cortex that is the primary receptive area for vision.

cortex of thymus  the outer part of each lobule of the thymus; it consists chiefly of closely packed lymphocytes (thymocytes) and surrounds the medulla.

visual cortex  the area of the occipital lobe of the cerebral cortex concerned with vision.

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visual cortex

n.

The region of the cerebral cortex occupying the entire surface of the occipital lobe and receiving the visual data from the lateral geniculate body of the thalamus. Also called visual area.

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visual

pertaining to vision.

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visual acuity test

performed by walking the animal through an obstacle course. A room full of unfamiliar furniture, or a stairway is usually used for companion animals. Farm animals are led or driven through a passage with drums or boxes strewn across it.

visual cortex

the part of the cerebral cortex which deals with images received by the visual apparatus.

visual evoked potentials (VEPs)

see visual evoked response.

visual following

movement of the eyes in watching a moving object.

visual pathway

the bulk of the retinal ganglion cells have axons in the optic nerve which synapse with cells in the lateral geniculate nucleus in the thalamus, which project to the visual cortex in the occipital lobe of the cerebrum; in a secondary visual pathway the axons of the remainder of the retinal ganglion cells terminate in the anterior rostral colliculus (pretectal region).

visual system

includes the eye, the optic nerve and the optic cortex in the cerebrum. The oculomotor, trochlear, abducent, trigeminal and facial nerves are all involved in reflexes which are part of the animal's responses to visual stimuli.

visual yellow

all-trans retinal; see retinal (2).