82 



ANATOMY FOR NUKSES. [CHAP. VII. 



gray fibres (naked axones and dendrones), all held together 

 and supported by delicate connective tissue. The majority 

 of the medullated fibres run in a longitudinal direction. There 

 is no real division between the brain and spinal cord, the brain 

 being built upon the cord, and together they form the great 



FIG. 70. TRANSVERSE SECTIONS OF THE SPINAL CORD AT DIFFERENT LEVELS. 

 (Gowers.) (Twice the natural size.) 



nerve-centre or axis the cerebro-spinal which, by means 

 of the cranial and spinal nerves, is placed in connection with all 

 parts of the body. 



The spinal nerves. There are thirty-one pairs of spinal 

 nerves, arranged in the following groups, and named from 

 the regions through which they pass. They are : 



