The cerebrum is noteworthy for its convoluted surface. The bumps are called gyri, and the grooves are called sulci or, if they are especially deep, fissures. The precise pattern of gyri and sulci can vary considerably from person to person, but many features are common to all people. Some of the important landmarks are labelled below. The postcentral gyrus lies immediately posterior to the central sulcus, and the precentral gyrus lies immediately anterior to the central sulcus. The neurons of the postcentral sulcus are involved in somatic sensation, and those of the precentral gyrus control voluntary movement. Neurons in the superior temporal gyrus are involved in hearing.
Lateral (Sylvian) fissure
Precentral gyrus
Central sulcus
Postcentral gyrus
Superior temporal gyrus
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