Color Atlas of Human Anatomy, Vol. 3: Nervous System and Sensory Organs by Werner Kahle & Michael Frotscher

Author:Werner Kahle & Michael Frotscher [Kahle, Werner]
Language: eng
Format: azw3, epub
Publisher: Thieme
Published: 2015-05-13T04:00:00+00:00

Exposure of the Roof of the Diencephalon (B)

This is an oblique horizontal section below the corpus callosum, which has been completely removed. Upon opening the two lateral ventricles, the dorsal aspect of the caudate nucleus (B13) and, bordering medially, the dorsal aspect of the thalamus (B14) become visible. Parts of the diencephalon become exposed as well, namely, the pineal gland (B15) and both habenulae (B16) which are connected to it. The two fornices (B17) between the heads of the two caudate nuclei have been cut in their rostral part (columns of fornix). The septum pellucidum (B18) extends from there to the corpus callosum.

The lateral wall of the hemisphere contains a particularly wide medullary layer between the cortex and the ventricle, the semioval center (B19). The central sulcus (B20) cuts into it and separates the frontal lobe (at the top of the figure) from the parietal lobe (bottom). Starting from the central sulcus, the precentral gyrus (B21) and the postcentral gyrus (B22) can be located.

Caudally in the longitudinal cerebral fissure (AB23), the cerebellum (B24) is visible. The caudal portion of the hemisphere is formed by the occipital lobe. The striate area (B25), the visual cortex, lies in this region and occupies primarily the calcarine sulcus (B26) at the medial aspect of the occipital lobe, while extending only a short distance onto the occipital pole. It can be distinguished even by the naked eye from the rest of the cortex through a white streak, the line of Gennari (B27), which divides the cortex into two gray bands. Gennari's line is a wide band of myelinated nerve fibers corresponding to the slightly narrower external band of Baillarger in the other areas of the neocortex (see p. 242, A16; p. 256).

B28 Mesencephalic tectum.

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