Superolateral Surface of the Right Cerebral Hemisphere
The superolateral surface of the right cerebral hemisphere is visualized in this specimen. The superolateral surface is arbitrarily divided into four lobes: frontal, parietal, temporal and occipital with the help of three main sulci, i.. e., central, lateral, and parieto-occipital and two imaginary lines. The first imaginary line is a vertical line joining the parieto-occipital sulcus to the preoccipital notch. The second line is a backward continuation of the horizontal part of the posterior ramus of the lateral sulcus till it joins the first line.
The grey matter of the cerebrum is arranged in the form of sulci and gyri.
- The following gyri are identified in this specimen:
- Pre-central gyrus
- Superior, Middle and Inferior frontal gyri
- Post-central gyrus
- Superior and Inferior parietal lobules
- Superior, Middle and Inferior temporal gyri
The area between the central and precentral sulci is called the pre-central gyrus. The primary motor area (area 4 of Brodmann) is located in the pre-central gyrus.
Superior, Middle and Inferior frontal gyri :
Anterior to the pre-central sulcus there are two sulci called superior and inferior frontal sulci which run horizontally. These sulci divide the region of frontal lobe in front of precentral sulcus into superior, middle and inferior frontal gyri.
Post-central gyrus :
The area between the central and post-central sulci is called the post-central gyrus. The primary sensory area (area 3, 1 and 2 of Brodmann) is located in the post-central gyrus.
Superior and Inferior parietal lobules :
The area of the parietal lobe behind the post-central gyrus is divided by the intraparietal sulcus into superior and inferior parietal lobules.
Superior, Middle and Inferior temporal gyri:
The superior and inferior temporal sulci present in the temporal lobe divides the lobe into superior, middle and inferior temporal gyri.