482 



SIR CHARLES BELL ON THE BRAIN. 



The symptoms attributed to disease of the cerebellum do not remove the obscurity 

 which invests this part of anatomy. We know that sometimes the whole hemisphere 

 of the cerebellum is destroyed by suppuration, without loss either of sense or of 

 motion. Moreover, when symptoms do attend disease of the cerebellum, its juxta- 

 position to the medulla oblongata inclines us to suspect that the effects are produced 

 through the latter body. The substance of the cerebellum is not of diameter sufficient 

 to have a large clot of blood in it, or a large abscess, without blood or matter com- 

 municating with either the fourth ventricle, or bursting out upon the surface. The in- 

 fluence thus becomes general on the nervous system, and a confusion in the symptoms 

 is the necessary result. We have no distinct and well-marked cases of disease in 

 the substance of the cerebellum, such as we possess of disease in the cerebrum ; and 

 on the whole it does not appear to stand in direct relation to the motions of the frame, 

 or to the common sensibility. 



Explanation of the Plates. 



Plate XIX. 



The figure in this Plate represents the great anterior column which gives off the 

 nerves of motion. 

 A, A. The fibrous texture of the hemisphere, concentrating to form the anterior 

 portion of the crus cerebri. 

 B. The anterior column where it is passing the pons Varolii. 

 c. The right pyramidal body; a little further down is the point of decussation. 

 D. The remaining part of the pons Varolii, a portion having been dissected off 

 to expose b. 



1. The olfactory nerve in outline. 



2. The union of the optic nerves. 



3, 3. The third nerve. 



4, 4. The fourth nerve. 



5, 5. The fifth nerve, trigeminus. 



6, 6. The muscular division of the fifth nerve. 



7. The sensitive root of the fifth nerve. 



8. The sensitive root rising from the posterior part of the medulla oblongata. 



9. The sixth nerve. 



10. The portio mollis of the seventh nerve, or auditory nerve. 



1 1 . The portio dura of the seventh nerve, or facial nerve. 



12. The eighth nerve, viz. par vagum, glosso-pharyngeal nerve, and spinal ac- 



cessory nerve. 



13. The ninth nerve, or lingual nerve. 



14. Spinal nerves. 



15. Spinal accessory nerve of the right side. 



