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

Farlex Partner Medical Dictionary © Farlex 2012

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.

Medical Dictionary for the Health Professions and Nursing © Farlex 2012

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.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

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References in periodicals archive

Krubitzer, "Connections of auditory and visual cortex in the prairie vole (Microtus ochrogaster): evidence for multisensory processing in primary sensory areas," Cerebral Cortex, vol.

How Senses Work Together: Cross-Modal Interactions between Primary Sensory Cortices

Furthermore, it is aimed to explore the plasticity of the visual cortex after vision improvement in terms of the functional changes of both some specific subareas within the visual cortex and higher cognitive networks that extend beyond the visual cortex.

Changes in the Vision-related Resting-state Network in Pituitary Adenoma Patients After Vision Improvement

Role of layer 6 of V2 visual cortex in object-recognition memory.

About 90% of the output from the retina flows to the LGN and then to V1, whereas the remaining 10% is projected to the superior colliculus and then to the pulvinar, reciprocally connecting with the extrastriate areas surrounding the primary visual cortex (Tong, 2003).

A proposed process for experiencing visual images of targets during an ESP task/Un posible proceso en la experimentacion de imagenes visuales durante una tarea PES/Proposition d'un processus pour faire l'experience d'images visuelles de cibles durant une tache d'ESP/Vorschlag, wie sich die aufnahme visueller bilder van zielobjekten wahrend einer ASW-Aufgabe erfassen lasst

The 2-week-long treatment also increased the regional cerebral blood flow (CBF) especially in the thalamus, basal ganglia and visual cortex of the nonsymptomatic hemisphere.

Clinical and non-clinical investigations using positron emission tomography, near infrared spectroscopy and transcranial doppler methods on the neuroprotective drug vinpocetine: a summary of evidences

As a result, it was found that neural response elicited by the stimuli at the attended location is amplified in the primary visual cortex (V1) and primary auditory cortex (A1) as they first arrive there.

RIKEN Laboratory for Brain Dynamics Furthers Understanding of Spatiotemporal Response Changes: Multi-media News Release

The magazine you're now holding, or the computer screen you're looking at, sends constantly changing inputs to your eye and optic nerve, but the subsequent pattern of neurons firing in your visual cortex displays an underlying stability.

Are we just really smart robots? Two books on the mind put the human back into human beings

This can be made through the activation of a population of neurons or represented in a hypercolumn in the visual cortex, but being one or the other it has a specific pattern that allows that object to be recognised as unique.

Visual imagery without visual perception?

In addition, specialized neural populations exist in different areas of the visual cortex both within and between hemispheres that are more responsive to some features than others (for example, color, motion, size, shape, volume, brightness, and binocular disparity, among others).

The bilateral brain: are two better than one?

NEURONAL DENSITY IN PRIMARY VISUAL CORTEX (17 VISUAL AREA), IN TWO WILD RODENT SPECIES

Densidad neuronal en la corteza visual primaria (area 17), de dos especies de roedores silvestres

Kahn, indeed, could not imagine a building viewed other than in natural light but the Western predilection for flooding our buildings with daylight leaves little for our visual cortex or our imagination to infill.

Meier no Kahn