82 



ANATOMY FOR NURSES. 



[Chap. VII. 



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

 and supported by delicate connective tissue. The majority 

 of the raedullated 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 



Fia. 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 : — 



