682 



OF THE FUNCTIONS OF THE NERVOUS SYSTEM. 



Its fibres may be traced upwards into the Thalanri Optici ; whilst they pass 

 through the Posterior Pyramids into the posterior portion of the lateral col- 

 umns, and also into the posterior columns of the Spinal Cord. With this tract 

 are connected nearly the whole of the roots of the Pneumogastric and Glosso- 

 pharyngeal nerves, and the larger or sensory root of the 5th pair. The greater 

 part of the motor tract decussates where the Anterior Pyramids become conti- 

 nuous with the lateral columns of the Spinal Cord; on the other hand, the 

 greater part of the Sensory tract decussates in its passage through the Pons 

 Varolii [Fig. 181*]. The following tabular view may assist in conveying a 



Fig. 182. 



A plan of the branches of the fifth nerve, modified from a sketch by Sir C. Bell. a. Submaxillary gland, 

 with the submaxillary ganglion above it. 1. Small root of the fifth nerve, which joins the lower maxillary 

 division. 2. Larger root, with the Gasserian ganglion. 3. Ophthalmic nerve. 4. Upper maxillary nerve. 5. 

 Lower maxillary nerve. 6. Chorda tympani. 7. Facial nerve. 



knowledge of this somewhat intricate piece of Anatomy ; which, when once 

 mastered, will be found to be really simpler than it appears. 



SPINAL CORD. MEDULLA OBLONGATA. 



Antwior or Motor Division, 

 f Arciform fibres of Olivary and Anterior Pyramidal 



BRAIN. 



columns ..... 



. . . n , I Posterior portion of Olivary columns 



Anterior Columns j Anterior portion of ()livary colllmna 



Cerebellum. 

 Corpora Quadrige- 

 1 mina. 



I Non-decussating portion of Anterior Pyramidal I 



columns 



Anterior portion of f Decussating portion of Anterior Pyramidal col- 

 Lateral Columns \ umns 



\- Corpora Striata. 



