In the occipital lobe, on the contrary, the gyri were complete in number and of regular arrangements.
This is usually H-shaped, and the gyri are therefore anterior, posterior, external and internal.
There are three or four gyri disposed round each other, of which the lowest surrounds the Sylvian fissure.
gyrus gy·rus (jī'rəs)
n. pl. gy·ri (-rī')
Any of the prominent, rounded, elevated convolutions on the surfaces of the cerebral hemispheres.