The anatomy of the nervous system, from the standpoint of development and function . ar lobule, occupying a large part of this surface alongits dorsolateral border. THE CEREBELLUM 199 2. The bivcnlral lobule, occupying the ventrolateral part of the inferior surface. 3. The tonsil, a small rounded lobule near the inferior vermis. 4. The flocculus is the smallest of the lobules; and from it there runs towardthe median plane a thin white band, the posterior medullary velum, and thepeduncle of the flocculus. Structure of the Cerebellum.—The cerebellum is composed of a thin super-ficial lamina of g
The anatomy of the nervous system, from the standpoint of development and function . ar lobule, occupying a large part of this surface alongits dorsolateral border. THE CEREBELLUM 199 2. The bivcnlral lobule, occupying the ventrolateral part of the inferior surface. 3. The tonsil, a small rounded lobule near the inferior vermis. 4. The flocculus is the smallest of the lobules; and from it there runs towardthe median plane a thin white band, the posterior medullary velum, and thepeduncle of the flocculus. Structure of the Cerebellum.—The cerebellum is composed of a thin super-ficial lamina of gray matter, spread over an irregular white center that con-tains several compact nuclear masses. This white medullary body forms acompact mass in the interior and is continuous from hemisphere to hemispherethrough the vermis, within which, however, it is smaller than in the hemi-spheres (Figs. 140, 141). As is most readily seen in sagittal sections through thecerebellum, the medullary body gives off numerous thick laminae, which pro- Dentaie nucleus Central lobuleLingula Culmen. Fissura prima/ ^—Declive TuberPyramisNodule UvulaFig. 140. Fig. 141. Figs. 140 and 141.—Sagittal sections of the human cerebellum: Fig. 140 passes through thehemisphere and dentate nucleus; Fig. 141, through the vermis in the median plane. ject into the lobules of the cerebellum; and from these there are given off sec-ondary and tertiary laminae at various angles. Thus a very irregular whitemass is formed, over the surface of which the much folded cortex is spread ina thin but even layer. Supported by the white laminae, the cortex forms longnarrow folds, known as folia, which are separated by sulci and which are aggre-gated into lobules that, in turn, are separated by more or less deep through the cerebellum at right angles to the long axis of the folia thuspresent an arborescent appearance to which the name arbor -cita has been ap-plied. This is particularly evident in sections
Size: 2545px × 982px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectnervoussystem, bookye
