. The nervous system: an elementary handbook of the anatomy and physiology of the nervous system for the use of students of psychology and neurology . ebellarhemispheres. On the upper sur-face the vermis presents as a slightmedian elevation between thehemispheres; on the under surfaceit lies at the bottom of a deepgroove and is partly hidden by theoverlapping of the hemispheres. The surface of the cerebellum is incised by a series of slightly carved trans-verse fissures, practically parallel to one another and lying very close together(Fig. 51). Some of the fissures extend for a considerable d
. The nervous system: an elementary handbook of the anatomy and physiology of the nervous system for the use of students of psychology and neurology . ebellarhemispheres. On the upper sur-face the vermis presents as a slightmedian elevation between thehemispheres; on the under surfaceit lies at the bottom of a deepgroove and is partly hidden by theoverlapping of the hemispheres. The surface of the cerebellum is incised by a series of slightly carved trans-verse fissures, practically parallel to one another and lying very close together(Fig. 51). Some of the fissures extend for a considerable distance into thecerebellar substance, and are used for descriptive purposes to divide thecerebellum into lobes which, however, are of no specific physiological im-portance. The cerebellum is connected with the rest of the brain by threeroots or peduncles—superior, middle, and inferior—on either side. The superiorpeduncles run upwards towards the mid-brain, gradually converging towards oneanother as they ascend. They are connected to one another by a thin plate ofnervous tissue—the valve of Vieussens—and disappear from surface view under. Anterior median fissure. 2. FourtliTeiitricle. 5. BUet. 7. Inferior olivary nucleus. 8. Hypoglossal nerre,with 8, its nucleus. 9. Vagus, with 9, its nuoleus. ambiguus. 12, Gracile nucleus. 13. Guneatenucleus. 14. Head of posterior horn. 48 THE NERVOUS SYSTEM Fia. 50.—Transverao section of the pons at its upper part. (Testut.)
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