Visual Cortex

Question 1. Write a short note on the visual cortex.

Answer.

Visual Cortex. The visual cortex is present over the occipital lobe.

It is located along the lips and floor of the posterior part of the calcarine sulcus (also called post postcalcarine sulcus).
Anteriorly, it extends up to the parieto-occipital sulcus and posteriorly, it extends on the outer surface of the occipital pole and is limited by the lunate sulcus.
It includes the cuneus and lingual gyrus.

Visual cortex

Question 2. Write a short note on visual areas.

Answer. Location Of Visual Areas

The primary visual area (Brodmann area 17) is located in the walls and floor of post postcalcarine sulcus.
The secondary visual areas (Brodmann areas 18/peristriate area and 19/parastriate area) surround the primary visual area and occupy most of the remaining visual cortex.

Primary visual cortex

Functions Of Visual Areas

The primary visual area is concerned with the reception and perception of isolated visual impressions such as colour, size, and form.
The secondary visual areas relate the isolated visual impressions received by the primary visual area with experience, thus enabling the individual to recognize and interpret what he/she is seeing.

Applied Anatomy Of Visual Areas

Lesions of the primary visual area result in loss of vision in the opposite visual field (crossed homonymous hemianopia).
Lesions of the secondary visual areas result in a loss of the ability to recognize objects (visual agnosia).

Reader Interactions