. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 17 16 15 14 13 12 11 Fig. 10-2. Brain, lateral view. 1 Pseudosylvian fissure, 2 temporal lobe, 3 vermis, 4 cerebellar hemisphere, 5 parafloccular lobe, 6 glossopharyngeal n., 7 vagus n., 8 accessory n., 9 first cervical spinal n., 10 hypoglossal n., 11 myelencephalon, 12 vestibulocochlear n., 13 facial n., 14 pons, 15 abducent n., 16 trigeminal n., 17 mesencephalon, 18 piriform lobe, 19 optic n., 20 lateral olfactory tract, 21 lateral olfactory groove, 22 olfactory bulb. separated from the rest of the cerebral hemisphere by a dist
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 17 16 15 14 13 12 11 Fig. 10-2. Brain, lateral view. 1 Pseudosylvian fissure, 2 temporal lobe, 3 vermis, 4 cerebellar hemisphere, 5 parafloccular lobe, 6 glossopharyngeal n., 7 vagus n., 8 accessory n., 9 first cervical spinal n., 10 hypoglossal n., 11 myelencephalon, 12 vestibulocochlear n., 13 facial n., 14 pons, 15 abducent n., 16 trigeminal n., 17 mesencephalon, 18 piriform lobe, 19 optic n., 20 lateral olfactory tract, 21 lateral olfactory groove, 22 olfactory bulb. separated from the rest of the cerebral hemisphere by a distinct lateral olfactory sulcus, sulcus rhinalis lateralis. The optic chiasma, chiasma opticum, lies ventromedial to the junction of the lateral olfactory tract and piriform lobe and rostral to the stalk of the hypophysis. The hypophysis, hypophysis, lies medial and ventral to the lowest part of the piri- form lobe. The diencephalon is obscured from view by the piriform lobe. Only a small, triangular portion of the mesen- cephalon (crus cerebri) and its oculomotor nerve is visible between the hypophysis and the pons. The trochlear nerve emerges between the caudal border of the piriform lobe and the pons and crosses the lateral surface crus cerebri. The cerebellum, cerebellum, pons, pons, and my- elencephalon, myelencephalon, lie caudal to the fore- and midbrain. The cerebellum lies dorsal to the myelencephalon. It is approximately 12 mm wide and 12 mm high. The pons consists separates the mesencephalon and myelencephalon. The my- elencephalon lies caudal to the pons and ventral to the cerebellum. It gives rise to cranial nerves X to XI1 and continues caudally as the cervical spinal cord. Viewed ventrally (Fig. 10-3), the olfactory bulbs, olfactory peduncles and piriform lobes form the medial part of the cerebral hemispheres. The optic nerves converge at the optic chiasma and then di- verge as the optic tracts, tractus opticus. The latter pass caudolaterally, between the hypophysi
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