Atlas of Human Anatomy in Cross Section: Section 1. Head and Neck

Plate 1.6

Ronald A. Bergman, Ph.D., Adel K. Afifi, M.D., Jean J. Jew, M.D., and Paul C. Reimann, B.S.
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This section (looking down) is through the centrum semiovale (19) and superficial to the cerebral ventricles. The centrum semiovale (19) comprises the central white matter core of the cerebral hemispheres. The two hemispheres are separated by the falx cerebri (7), a dural fold within the interhemispheric fissure. The superior sagittal sinus is seen rostrally (22) and caudally (8) within the falx cerebri. The falx cerebri (7) is continuous with the dura mater around the cerebral hemispheres (10). Superficial to the dura mater (10) between it and the calvarium is the middle meningeal artery (3). Rupture of the middle meningeal artery, as occurs in some skull fractures, may lead to a life threatening epidural arterial hemorrhage, epidural hematoma. The superficial temporal artery ( 13) is seen within the scalp (5). In the frontal lobe are seen the superior (1, 21) and the middle (18) frontal gyri separated by the superior frontal sulcus (20). The precentral gyrus ( 16) is seen between the precentral (17) and the central (rolandic) (15) sulci. The precentral gyrus is the primary motor cortex. The central (rolandic) sulcus (15) separates the precentral gyrus (16) of the frontal lobe from the postcentral gyrus (14) of the parietal lobe. The postcentral gyrus (14) is the primary somatosensory (somesthetic) cortex. In the parietal lobe are also seen the supramarginal (12) and angular (11) gyri, two important gyri in association and language functions of the brain. On the medial surface of the parietal lobe is the precuneus gyrus (9). The cingulate gyrus (2) is seen on the medial surface of the hemisphere; its white core, the cingulum (4), is one of the important long association bundles of the cerebral hemispheres.

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