visual cortex

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Related to Primary visual cortex: calcarine sulcus, temporal lobe, Primary auditory cortex, Visual association area

cortex

 [kor´teks] (pl. cor´tices) (L.)
the outer layer of an organ or other structure, as distinguished from its inner substance or medulla. adj., adj cor´tical.
adrenal cortex (cortex of adrenal gland) the outer, firm layer comprising the larger part of the adrenal gland; it secretes mineralocorticoids, androgens, and glucocorticoids.
cerebellar cortex the superficial gray matter of the cerebellum.
cerebral cortex (cortex cerebra´lis) the convoluted layer of gray matter covering each cerebral hemisphere. See also brain.
renal cortex the granular outer layer of the kidney, composed mainly of glomeruli and convoluted tubules, extending in columns between the pyramids that constitute the renal medulla.
striate cortex part of the occipital lobe that receives the fibers of the optic radiation and serves as the primary receiving area for vision. Called also first visual area.
visual cortex the area of the occipital lobe of the cerebral cortex concerned with vision; the striate cortex is also called the first visual area, and the adjacent second and third visual areas serve as its association areas.

vis·u·al cor·tex

the region of the cerebral cortex occupying the entire surface of the occipital lobe, and composed of Brodmann areas 17-19. Brodmann area 17 (which is also called striate cortex or area because the line of Gennari is grossly visible on its surface) is the primary visual cortex, receiving the visual radiation from the lateral geniculate body of the thalamus. The surrounding Brodmann areas 18 (parastriate cortex or area) and 19 (peristriate cortex or area) are probably involved in subsequent steps of visual information processing; Brodmann area 18 is referred to as the secondary visual cortex.
Synonym(s): visual area

vis·u·al cor·tex

(vizh'ū-ăl kōr'teks)
The region of the cerebral cortex occupying the entire surface of the occipital lobe, and composed of Brodmann areas 17-19. Area 17 (which is also called the striate cortex or area because the line of Gennari is grossly visible on its surface) is the primary visual cortex, receiving the visual radiation from the lateral geniculate body of the thalamus. The surrounding Brodmann areas 18 (parastriate cortex or area) and 19 (peristriate cortex or area) are probably involved in subsequent steps of visual information processing; area 18 is referred to as the secondary visual cortex.
Synonym(s): visual area.

visual cortex

the thin outer layer of grey matter in the occipital region of the CEREBRUM that is concerned with the interpretation of information from the eyes.

visual

pertaining to vision.

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).
References in periodicals archive ?
This area does not display the same cortical magnification as the primary visual cortex but it still maintains a retinotopic map of the visual scene in order to allow appropriate processing of signals.
Neural connections and receptive field properties in the primary visual cortex.
Using functional magnetic resonance imaging (fMRI), the researchers were also able to measure the surface area of the primary visual cortex in each volunteer.
The brain scans revealed greater blood flow in the key section of the primary visual cortex as participants used their trained eyes, compared with their untrained eyes.
However, according to a new investigation, at least one of these higher areas shapes what we see from the get-go, and it does it by actually suppressing activity in the primary visual cortex.
For example, Cohen and his colleagues have found that TMS applied to a brain region called the primary visual cortex impairs the ability of blind people to read Braille.
In the study, Huxlin studied seven people who had suffered a stroke that damaged an area of the brain known as the primary visual cortex or V1, which serves as the gateway to the rest of the brain for all the visual information that comes through our eyes.
From the primary visual cortex, these information streams diverge.
Henry Rusinek, a radiologist at New York University School of Medicine, said that the analysis of an area of the primary visual cortex called V1 suggested that the region performs complex functions, like focusing one's attention, independently of other brain regions.
Compared with good readers, dyslexics were less successful and exhibited reduced activity in the primary visual cortex and related brain areas involved in motion perception (SN: 3/7/98, p.
Relative to healthy adults, those with the visual variant of Alzheimer's disease displayed markedly lower glucose use in areas at the back of the brain, including the primary visual cortex, Pietrini and his coworkers report in the October American Journal of Psychiatry.