120 



THE HUMAN BODY. 



Fig. 29. Cerebro-spinal nervous 

 centre. 



parts of the encephalon, which are 

 the brain proper, or cerebrum; the 

 cerebellum, or little brain; the isth- 

 A mus of the encephalon, or the at- 

 tachment which joins the differ- 

 ent parts together; and the bulb 

 of the spinal cord, or medulla ob- 

 longata. 



The brain occupies nearly all 

 the cavity of the cranium, which 

 fits it like a mould. ( It is oval in 

 form, flattened on its inferior sur- 

 face, which rests on the base or 

 floor of the skull; its anterior or 

 frontal extremity is smaller than 

 the posteriory Its greatest trans- 

 verse diameter is the space be- 

 tween the temporal fossae. It is 

 divided in the median line by the 

 great fissure running from behind 

 forward vertically through part of 

 its depth into two portions, called 

 the hemispheres of the brain. This 

 j division is complete in front, at 

 / the back and on the top, but the 

 / two parts are united at the middle 

 and lower third by the corpus cal- 

 losum, the peduncles, and some 

 other parts situated in the middle 

 line. 



A lateral fissure, called the fis- 



A. Cerebrum- or brain proper. 



B. Cerebellum lesser brain. 



C. Pons l-'arolii. 



D, D. Spinal marrow, shoiving the origin 



of the spinal nerves. 



E, E. Spinous processes of the vertebra. 



F. Seventh cervical vertebra. 



G. Twelfth dorsal vertebra. 

 H. Fifth lumbar vertebra. 



I. Sacrum. 



