(b) The central sulcus is a cleft separating the frontal from the parietal
lobe. Roughly, each central sulcus runs from the left or right side of the cerebrum to top
center and over into the medial side of the cerebrum.
(c) There are two gyri that run parallel to the central sulcus. Anterior to
the central sulcus is the precentral gyrus. Posterior to the central sulcus is the
Figure 12-5. Left cerebral hemisphere.