. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NERVOUS CENTRES. (HUMAN ANATOMY. THE ENCEPHALOU.) 693 are the peduncles of the cms cerebelli. Through them the cerebellum forms a connection with other parts of the encephalon. The superior layer or peduncle is a bundle of fibres which extends to the corpora quadrigemina, and may be traced beneath them to the optic thalami. These are the procesms cerebelli ad testes, but from their being obviously a medium of con- nection between the cerebellum and the cere- brum, they may be better named cerebro-cere- bellur commissures
. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. NERVOUS CENTRES. (HUMAN ANATOMY. THE ENCEPHALOU.) 693 are the peduncles of the cms cerebelli. Through them the cerebellum forms a connection with other parts of the encephalon. The superior layer or peduncle is a bundle of fibres which extends to the corpora quadrigemina, and may be traced beneath them to the optic thalami. These are the procesms cerebelli ad testes, but from their being obviously a medium of con- nection between the cerebellum and the cere- brum, they may be better named cerebro-cere- bellur commissures. It is worthy of remark, that these are the only fibres which appear to connect these two segments of the brain. The middle layer is continuous with the restiform bodies, processus cerebelli ad medulluw oblon- galum. And the inferior layer is evidently de- rived from the transverse fibres of the pons Varolii, which thus pass from one hemisphere to the other, and constitute a great commissure to the cerebellar hemispheres. These fibres, moreover, connect each hemisphere to the me- socephale (fig. 380, t, r, v). From this triple constitution of the crus cerebelli, it is plain that the cerebellum may exert an influence upon, or be affected by the optic thalami or quadrigeminal bodies, the restiform columns, or the mesocephale. Of the fourth ventricle.—This is a rhomboi- dal cavity, situated at the upper and posterior part of the medulla oblongata, and extending over part of the superior surface of the meso- cephale. It is limited superiorly by the poste- rior margin of the testes, and inferiorly by the superior blunt extremity of the posterior pyra- mids. Its two lateral angles correspond to the entrance of the restiform bodies into the crura cerebelli. In fact, it is formed by the diver- gence of the restiform columns in their ascent to the hemispheres of the cerebellum. The median lobe of the cerebellum lies over the fourth ventricle, and conceals it from view. The anterior
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