Visual cortex

The visual cortex is the primary brain region responsible for processing visual information in the occipital lobe[5][7]. It is subdivided into hierarchically organized areas, with the primary visual cortex (V1, Brodmann's area 17) serving as the initial cortical processing station that receives input from the lateral geniculate nucleus via the optic radiations[1][6]. V1 is characterized by a laminar organization of six layers with specialized neuronal populations that process basic visual features such as orientation, spatial frequency, and motion[5][6]. Information from V1 is distributed along two parallel processing streams: the ventral stream (through V2, V4, to inferior temporal cortex) specialized for object recognition, and the dorsal stream (through V2, MT/V5, to posterior parietal cortex) specialized for motion and spatial localization[5]. Primate V1 is notably denser in neurons than nonprimate visual cortex, contributing to superior visual acuity[4]. While the visual cortex itself is not a pharmacological target, understanding its organization and function is critical for comprehending visual perception and interpreting visual field defects resulting from cortical lesions or neurological disease.

Other names

Striate cortexPrimary visual cortex (V1); Brodmann's area 17Secondary visual cortex (V2); Brodmann's area 18-19Occipital cortexExtrastriate cortex (for V2-V5 and beyond)