552 . Dynamic Theory. 



lower animals ; the brain being seated within the anterior end of the 

 body, receiving impressions from the sense organs and directing the 

 several movements. " 



CHAPTER LYII. 



ANATOMY OF THE BRAIN. 



The spinal cord, or medulla spinalis, is reckoned to end at the en* 

 trance of the skull the foramen magnum. The fibres of which it is 



1. Great longitudinal fissure. 



>ntal lobes of the Cerebrum. 



3. Olfactory bulb. 



4. Corpus Callosum. 



5. Fissure of Sylvius. 



6. Pituitary Glaiid. 



7. Optic nerve. 



X. Optic chiasm. 



8. Tuber cinereum. 



9. Third nerve Motor oculi. 

 10. Corpora Albicautia, or mammillary 



tubercles. 



11. Fourth nerve Pathetic. 

 12. Fifth nerve Trifacial, motor root. 

 13. sensory root. 



14. Crus cerebri Peduncle. 



FIG. 270. Base of the human brain. 



15. Sixth nerve Abduceus. 



16. Pons Varolii. 



17. Seventh nerve Facial. 



18. Middle lobe of the Cerebrum. 



19. Eighth nerve Auditory. 



20. Anterior Pyramid. Crossed fibres in 



lower part. 

 21. Ninth nerve Glosso Pharyngeal. 



22. Olivary body. 

 23. Tenth nerve Pneumogastric. . [gata. 

 24. Lateral tract of the Medulla Oblon- 

 25. Eleventh nerve Spinal-accessory. 

 26. Cerebellum. 

 27. Twelfth nerve Hypoglossal. 

 S. Subiculum cornu ammonis (inner an- 

 terior aspect of uncinate gyms.) 



