. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 148 Anatomy of the Woodchuck, Marmota monax A. Fig. 10-3. Brain, ventral view. 1 olfactory bulb, 2 medial olfactory tract, 3 lateral olfactory tract, 4 optic tract, 5 neuro- hypophyseal recess within the stalk of the hypophysis (removed), 6 mammillary body, 7 cerebral crus, 8 pons, 9 abducent n., 10 facial n., 11 vestibulocochlear n., 12 olive, 13 pyramid, 14 accessory n., 15 first cervical spinal n., 16 median fissure, 17 hypoglossal n., 18 vagus n. 19 glossopharyngel n., 20 parafloccular lobe of cerebellum, 21 trapezoid body 22
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. 148 Anatomy of the Woodchuck, Marmota monax A. Fig. 10-3. Brain, ventral view. 1 olfactory bulb, 2 medial olfactory tract, 3 lateral olfactory tract, 4 optic tract, 5 neuro- hypophyseal recess within the stalk of the hypophysis (removed), 6 mammillary body, 7 cerebral crus, 8 pons, 9 abducent n., 10 facial n., 11 vestibulocochlear n., 12 olive, 13 pyramid, 14 accessory n., 15 first cervical spinal n., 16 median fissure, 17 hypoglossal n., 18 vagus n. 19 glossopharyngel n., 20 parafloccular lobe of cerebellum, 21 trapezoid body 22 trigeminal n., 23 trochlear n., 24 oculomotor n., 25 tuber cinereum, 26 piriform lobe, 27 optic chiasma, 28 optic n., 29 olfactory peduncle. trum corporis callosi. The latter continues as the lamina terminalis. The rostral commissure, com- missura rostralis, is a prominent, round bundle of transverse nerve fibers in the lamina terminalis. Ventral to the corpus callosum is another prom- inent band of fibers, the fornix. The corpus callos- um and fornix are connected by a mass of septal nuclei known as the telencephalic septum, septum telencephali (formerly the septum pellucidum). The latter separates the two lateral ventricles, ventriculus lateralis, from each other. Ventral to the fornix is the cavity of the third ventricle, ventriculus tertius. The third ventricle encircles the interthalamic ad- hesion, adhesio interthalamica, which connects the left and right halves of the diencephalon. The lat- eral and third ventricles communicate with each other through the interventricular foramen, fora- men interventriculare. The latter is visible in the ros- tral part of the third ventricle, just lateral to the point where the fornix and interthalamic adhesion join. The third ventricle forms various recesses. These are the suprapineal recess, recessus suprapi- neal, that extends dorsal to the pineal gland, the pineal recess, recessus pinealis, in the peduncle of the pineal gland, an opt
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