6i8 



THE BRAIN. 



[CH. XLIII. 



CHAPTER XLIII. 



THE BRAIN. 



A STUDENT'S first glance at a brain, or at such a drawing of it 

 as is given in fig. 458, will be sufficient to convince him of its 

 complicated structure. It certainly is extremely complex, but by 

 studying it systematically \ve shall find that a knowledge of the 



Fig. 458. Base of the brain, i, superior longitudinal fissure; 2, 2', 2'', anterior cerebral 

 lobe ; 3, fissure of Sylvius, between anterior and 4, 4', 4", middle cerebral lobe ; 5, 5', 

 posterior lobe ; 6, medulla oblongata.; the figure is in the right anterior pyramid; 

 7, 8, 9, 10, the cerebellum ; +, the inferior vermiform process. The figures from I. to 

 IX. are placed against the corresponding cerebral nerves ; -in. is placed on the right 

 cms cerebri. VI. and VII. on the pons Varolii ; X. the first cervical or suboccipital 

 nerve. (Allen Thomson.) J. 



essential facts in its anatomy will be attainable with comparative 

 ease. An acquaintance with the structure of the brain is, more- 

 over, essential for understanding its functions. So we shall 

 devote this and a few succeeding chapters to anatomical conside- 

 rations, before passing on to the study of its physiology. 



