AND PHYSIOLOGY. 



319 



Fig. 304. 



a f b e 



Vertical Section of the Brain, Cerebellum, Pons Varolii, and Medulla Oblongata, 

 a, Anterior Lobe of the Brain. &, Middle Lobe, c, Posterior Lobe, d, Cerebellum, e, Me- 

 dulla Spinalis. J, Section of the Corpus Callosum. The Lateral Ventricles of the Brain 

 are situated on either side of the Corpus Callosum, which assists in forming their Upper 

 "Wall. Optic Lobes : 1, Olfactory Nerves. 2, The Eyeball, from which may be 

 traced the Optic Nerve as far as the Optic Thalami or Lobes. Close to this is the Nerve 

 of the Third Pair. 4, The Fourth Pair, distributed, like the Third, to the Muscles of the 

 Eyes. 5, Superior Maxillary Branch of the Fifth Pair. 5', Ophthalmic Branch of the 

 same Pair of Nerves. 5", Inferior Maxillary Branch of the same Pair of Nerves. 6, Sixth 

 Pair, proceeding to the Abducentes Muscle. 7, Facial Nerve: — under the origin o/ this 

 nerve may be seen a portion of the Acoustic 9, Nerve called Glosso-Pharyngeal. 10, 

 Pneumogastric Nerve ; close to it is 12, the Spinal Accessory. These three Nerves, the 

 Glosso-Pharyngeal, Pneumogastric, and Spinal Accessory, are by some reckoned as one 

 pair. 11, The Ninth Pair of some, and the Eleventh of others, called also Hypoglossal. 

 14 and 15, Cervical Nerves. 



and the minimum twenty ; the average capacity of the cra- 

 nia of Germans and Anglo-Saxons is ninety cubic inches. 

 Daniel Webster's cranium contained 122 cubic inches. 



570. Cerebellum. — The Cerebrum, by a band of thick 

 fibers, is connected with another body, of a pear shape, at- 

 tached to it by its base, called the Lesser Brain or Cerebel- 

 lum. (Fig. 306, p. 320.) This has about one eighth of the 



State the average capacity of Anglo-Saxon crania, and nUo that of Daniel Webster. 

 570. Describe the cerebellum. 



14* 



