. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Chapter 10—Central Nervous System 149. 19 18 17 15 16 14 13 Fig. 10-4. Brain, median section. 1 rostral colliculus, 2 pineal recess, 3 splenium of the corpus callosum, 4 body of the corpus callosum, 5 interventricular for., 6 rostral commissure, 7 telencephalic septum, 8 genu of the corpus callosum, 9 olfactory bulb, 10 optic chiasma, 11 interthalamic adhesion, 12 hypophysis, 13 cerebral cms, 14 mesencephalic aqueduct, 15 pons, 16 rostral medullary velum, 17 lingula, 18 caudal colliculus, 19 myelencephalon, 20 nodulus, 21 folia, 2
. Anatomy of the woodchuck (Marmota monax). Woodchuck; Mammals. Chapter 10—Central Nervous System 149. 19 18 17 15 16 14 13 Fig. 10-4. Brain, median section. 1 rostral colliculus, 2 pineal recess, 3 splenium of the corpus callosum, 4 body of the corpus callosum, 5 interventricular for., 6 rostral commissure, 7 telencephalic septum, 8 genu of the corpus callosum, 9 olfactory bulb, 10 optic chiasma, 11 interthalamic adhesion, 12 hypophysis, 13 cerebral cms, 14 mesencephalic aqueduct, 15 pons, 16 rostral medullary velum, 17 lingula, 18 caudal colliculus, 19 myelencephalon, 20 nodulus, 21 folia, 22 arbor vitae. 23 primary fissure, 24 transverse fissure. and the smaller caudal colliculus, colliculus caudalis, of the mesencephalon lie dorsally to the aqueduct. The mesencephalic peduncle, pedunculus cerebri, lies ventral to the aqueduct. The cerebellar cortex is arranged as thin leaves or folia, folia cerebelli. The folia consist of centrally located white matter, arbor vitae, covered by gray matter. The mesencephalic aqueduct continues caudally into the rhombencephalon as the fourth ventricle, ventriculus quartus. The roof of the fourth ventricle is formed by a rostral and a caudal medullary ve- lum, velum medulare rostrale and velum medulare caudale. The fourth ventricle continues caudally as the central canal of the spinal cord, canalis centralis. Subdivisions of the Brain. The telencepha- lon {cerebrum) is the largest, most rostral part of the brain. It is approximately 30 mm long, 30 mm wide and 20 mm thick. Along the midline, the ce- rebrum is divided into two cerebral hemispheres by the longitudinal fissure. The cerebral hemispheres are separated caudally from the cerebellum by the transverse fissure. Each cerebral hemisphere con- sists of frontal, parietal, occipital and temporal lobes. The lobes are topographical areas and their boundaries are quite arbitrary. The frontal lobe comprises the rostral part of the cerebral hemi- sphere, the occipital lobe the caudal
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