. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. THE HINDBRAIN 357 ib) (c). The various folds of the cerebellar surface are designated as indicated in Figs. 118 and 119. The parts named lobulus ansiformis and lobulus paramedianus together make up the cerebellar hemisphere. The cerebellum is concerned chiefly with the co-ordination of muscular action, the regulation of the "tone" of the muscles, and the preservation of the equilibrium of the body. The cerebellar hemispheres are specially related to the cerebral
. Bensley's Practical anatomy of the rabbit : an elementary laboratory text-book in mammalian anatomy. Rabbits -- Anatomy. THE HINDBRAIN 357 ib) (c). The various folds of the cerebellar surface are designated as indicated in Figs. 118 and 119. The parts named lobulus ansiformis and lobulus paramedianus together make up the cerebellar hemisphere. The cerebellum is concerned chiefly with the co-ordination of muscular action, the regulation of the "tone" of the muscles, and the preservation of the equilibrium of the body. The cerebellar hemispheres are specially related to the cerebral hemispheres and receive large numbers of fibres (from the pons) bearing impulses from the latter so that they may co-ordinate the con- tractions of muscles activated by direct impulses from the same source. The areas of the two crura of the ansiform lobule indicated by hatching in Fig, 120 have been shown to be proportional to the weight of the muscle masses of the fore and hind limbs respectively in the rabbit and the re- mainder of the hemisphere appears to be related to ability to perform quick, powerful movements of the hind limbs and trunk. The anterior medullary velum (velum medullare anterius) is the thin membrane underlying the anterior portion of the cerebellum, attached to the ventral surface of the latter and connecting it w4th the inferior colliculi (Fig. 124). It forms a small anterior portion of the roof of the fourth ventricle. The fourth cranial, or trochlear nerve (n. trochlearis), which supplies the superior oblique muscle of the eye, emerges from the anterior medullary velum and runs transversely on to the lateral surface of the cerebral peduncle. Here the cut end of the proximal portion of the nerve is usually to be found. Fig. 120. Lat- eral view of the ansiform lobule as in Fig. 118, the superior crus hatched t r aiis-verse ly and the inferior crus hatched vertically. The areas of the two crura are pro- portional to the weights of the muscles of the anteri
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