SPINAL COED. 



is? 



where the trunks to the lower limbs take origin. It is 

 divided into two symmetrical parts by a deep anterior 

 median fissure, and by what is called the posterior median 

 fissure, which is deeper than the anterior, but is not a 

 true fissure, being only a septum of the proper connective 

 tissue of the cord with larger vessels in it than are found 

 in the nervous substance. Between these two fissures 

 is the microscopically small central canal, situated in grey 

 matter constituting what is called the grey commissure, 

 in contradistinction to a little white matter in front of it, 

 called the white commissure. On each side, the grey com- 

 missure spreads out into an extended mass of grey matter, 



Fig. 98. SPINAL CORD, transverse section; a, anterior fissure; 6, 

 central canal ; c, grey commissure ; d, white commissure ; e, e, 

 bundles of anterior root of nerve coming from the anterior cornu 

 of the grey matter ; /, posterior root passing in to the posterior 



