. Practical anatomy of the rabbit : an elementary laboratory textbook in mammalian anatomy . Rabbits; Anatomy, Comparative. 276 Anatomy of the Rabbit. (c) The third cranial, or oculomotor nerve (n. oculomotorius), arises from the ventral surface of the cerebral peduncle. IN THE rhombencephalon: (a) The cerebellum forms an arch over the posterior portion of the brain, and is supported by stout pillars from its sides. In addition to the ridges of its surface the whole structure is divided into several lobes, including the median portion or vermis, the lateral hemispheres, and the stalked bodies,
. Practical anatomy of the rabbit : an elementary laboratory textbook in mammalian anatomy . Rabbits; Anatomy, Comparative. 276 Anatomy of the Rabbit. (c) The third cranial, or oculomotor nerve (n. oculomotorius), arises from the ventral surface of the cerebral peduncle. IN THE rhombencephalon: (a) The cerebellum forms an arch over the posterior portion of the brain, and is supported by stout pillars from its sides. In addition to the ridges of its surface the whole structure is divided into several lobes, including the median portion or vermis, the lateral hemispheres, and the stalked bodies, or paraflocculi, arising from the hemispheres. (b) The anterior medullary velum (velum medullare an- terius) is the thin membrane underlying the anterior portion of the cerebellum and connect- ing, the latter with the inferior CoUiculi. It forms a small an- terior portion of the roof of the fourth ventricle. (c) The fourth cranial, or troch- lear nerve (n. trochlearis), arises from the anterior medul- , lary velum. The first portion of the nerve is usually to be found on the lateral surface of the cerebral peduncle. (d) The posterior medullary velum (velum medullare pos- terius) underlies the,, posterior margin of the cerebellum, and extends backward over the tri- angular space enclosed by the walls of the fourth ventricle. The structure forms a chorioid plexus, similar in character to that of the third ventricle but much less extensive. It is commonly torn away in the preparation of the brain, in which case the interior of the fourth ventricle is exposed. ,. Fig. 8s. The rhombencephalon'. Ventral view (the cerebellum not figured). , trapezoid body; , foramen caecum; , cervical flexure; f.', anterior median fissure; pons; , cerebral peduncle (mesence- phalon); py., pyramid. Ill, oculomotor nerve; IV, troch- lear; .VI, poriio major of the trige- minus; V2, portio minor; VI, ab- 'ducens; VII, facial; Vlli, acoustic. IX-XI, glossopharyngeal, vagus, and spin
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