The anatomy of the nervous system, from the standpoint of development and function . nferior precentral sulci (Fig. 168). The superior frontal sulcus usually beginsin the superior precentral sulcus and runs rostrally, following in a general waythe curvature of the dorsal border of the hemisphere which it gradually ap-proaches. The inferior frontal sulcus usually begins in the inferior precentralsulcus and extends rostrally. arching at the same time toward the base of thehemisphere. Between the precentral and central sulci lies the anterior central gyrus inwhich is found the motor area of the c
The anatomy of the nervous system, from the standpoint of development and function . nferior precentral sulci (Fig. 168). The superior frontal sulcus usually beginsin the superior precentral sulcus and runs rostrally, following in a general waythe curvature of the dorsal border of the hemisphere which it gradually ap-proaches. The inferior frontal sulcus usually begins in the inferior precentralsulcus and extends rostrally. arching at the same time toward the base of thehemisphere. Between the precentral and central sulci lies the anterior central gyrus inwhich is found the motor area of the cerebral cortex. The remainder of this Anterior central gyms Superior precentral sh/chs ; Superior frontal gyrus -- Superior frontal sulcus--Middle frontal gyrus—MiddU frontal sideInferior frontal sulcusluf rior precentral sulcus .Inf. Pars triang. ?gyrus Pars orbitalis- Lateral Ant. hor. ram. / cerebraHAnt. ascend, y fissure Post, , Superior temporal sulcus, Superior temporal gyrus , Central sulcus , Posterior central gyrusPostcentral sulcus. , Supramarg. gyrusl ;.,^Angular gyrus ^^ --- Superior parietal lobule —- Interparietal sulcus / \\ r Trails, occipital sulcusSulcus lunatus \\ Inferior temporal gyrusS?Middle temporal sulcusMiddle temporal gyrus Fig. 168.—Sulci and gyri on the lateral aspect of the human cerebral hemisphere. surface of the frontal lobe is composed of three convolutions, the superior,middle, and inferior frontal gyri. separated from each other by the superior andinferior frontal sulci. The inferior frontal gyrus, which in the left hemisphereis also known as Brocas convolution, is subdivided by the two anterior rami ofthe lateral sulcus into three parts, known as the orbital, triangular, and oper-cular portions. The orbital part of the inferior frontal gyrus lies rostral to theanterior horizontal ramus of the lateral sulcus; the triangular part is a wedge-shaped convolution between the two anterior rami of that fissur
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