Diseases of the nervous system / edited by Archibald Church.

Date:
1908
Catalogue details

Licence: In copyright

Credit: Diseases of the nervous system / edited by Archibald Church. Source: Wellcome Collection.

    50/1256 page 22
    brum, for in animals in which the latter is markedly developed the former is likewise, and when there is atrophy of one hemisphere of the brain, atrophy of the crossed half of the cerebellum is also observed. The cerebellum is com- posed of the vermis situated in the middle and of two hemispheres. It is united with the red nucleus and the thalamus opticus by the anterior brachium con- junctivum, sends the middle brachium conjunctivum or pontal arms to the pons, and by means of the posterior brachium conjunctivum, the corpora restiformia, is connected with the medulla and the spinal cord. The vermis of the cerebellum is divided into lobes by furrows; the most important which lie dorsally upon the upper vermis, and extend from before backward, are the lingula, the central lobe, and the monticulus, and upon the lower vermis the nodulus, uvula, pyramis and the tuber vermis. The hemispheres of the cere- bellum show above, dorsally, and anteriorly a quadrangular lobe at the side of the monticulus, and posteriorly the lobulus semilunaris superior; below, besides the nodulus, is the flocculus, upon the uvula the tonsilla, laterally from this the cuneiform lobe, to which the inferior posterior lobe is posteriorly, joined. The vermis and hemispheres possess a medullary nucleus; in its interior, particularly in the vermis, gray nuclei are found, also the corpus dendatum at the boundary of the vermis and hemispheres, and medially from this the embolus, the nucleus globosus, and the tegmental nucleus. From the cerebellum over the fourth ventricle to the corpora quadrigemina passes ante- Fig. 15.—The Cerebellum from the Ventral Side. (After Edinger.) riorly the velum medulläre anticum, posteriorly the velum medulläre posticum, and these extend to the posterior columns of the spinal cord. The plexus chorioidei, situated in the region of the Ventricles, and which also passes into the sinuses of the fourth ventricle and into open spaces the largest of which is the foramen of Magendie, permits communication with the arachnoid space; this is of importance in equalizing variations of pressure. The manifold communications of the cerebellum with most of the other structures of the central nervous system by means of the brachium conjunctivum cannot here be mentioned; they have become known only by minute comparative anatom-
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