554: Dynamic Theory. 



of the bodies of the medulla oblongata, except the anterior pyramids. 

 These gray bodies, like the gray matter of the spinal cord, are situated 

 in the interior and covered by the white, fibrous substance, but are not 

 diffused through the body of the organ. The ganglion in the center of 

 each olivary body is called the olivary ganglion, or sometimes the corpus 

 dentatum. This is the nucleus of the glosso pharyngeal nerve, and also 

 the lingual branch of the fifth nerve. The ganglion in the restiform 



FIG. 271. 



FIG. 271. Section through Brain, showing mesial surface of right hemisphere, and po- 

 sition of central and basal ganglia. ( After Allen Thompson, slightly altered.') 



1, 2, 3, 3a, 3b. Are on cerebral convolutions. 



4-ith ventricle, same shape as Septum Lucidum. 

 > Third ventricle, and position of Right Optic Thalamus. 



6. Position of the buried right anterior pillar of Fovnix. 



7. Secti i on of Pons Varolii. 8. Medulla Oblongata. 



9. -Cerebellum. lO.-Crus Cerebri. 



i }h K ,? urtl l vent "de under and between the peduncles of the cerebellum. The 

 White band to the right is the posterior cerebellar peduncle. 



12. Corpora Quadrigemina. 



} ? -~ pineai lar ?d, its right peduncle reaching forward. To the left of the figure is the 



Jl~ A * C 9 mim ssure. [ posterior commissure. 



15. Anterior commissure, and position of Corpus Striatum. 



16. Lamina Cmerea. 



}Z'~. e< ? tio 9i? Pit uitary body-its two lobes. 



lg- Tuber Cmereiim. . [ mammillary tubercle. 



S TT W I ln - ! H ie anterior pillar of the fornix which forms the Corpus Albicans, or 

 cerebell Vieussens seen edgewise. It covers the right anterior peduncle of the 



body is the ganglion of the tenth pair (vagus, or pneumogastric), and 

 also of some of the roots of the glosso pharyngeal. This is probably 

 the sensory ganglion for the visceral parts of the body. The ganglion* 

 belonging to the posterior pyramids, is situated on the floor of the fourth 

 ventricle, a cavity formed by the widening of the posterior fissure of 

 the medulla oblongata. This ganglion belongs to the auditory nerve. 

 In man, and the higher mammals, it is small, having been superseded 

 by other ganglia in the optic thalamus and cerebrum. But in some of 

 the fishes this is a large and distinct center like the optic lobes. The 



