THE SPINAL CORD 



765 



Kio. 569. (Continued.) 



Via. 569. TRANSVERSE SECTIONS FROM DIFFF.RF.XT SFCMFNTS <>! THE SPINAL CORD, SHD\VIN<; 

 SnAi'i: AND KELATIVK I'uoroi: i IONS OF (iitEY AND WIIITK SCHSTANCE IN THE DIFFER- 

 ENT SEGMENTS KEI-KESEN i in. 





LUMBAR III 



SACRAL IV 



COCCYGEAL 



axones of the spinal cord course longitudinally and thus coursing, form the thick man- 

 tle surrounding the column of grey substance. This mantle is divided into right and 

 left homolateral halves by the anterior median fissure along its ventral aspect, and 

 along its dorsal aspect by the posterior septum, which is for the most part a connective- 

 tissue partition derived from the pia mater along the line of the posterior median 

 sulcus. The mantle is supported internally by intenvoven neuroglia and white 

 fibrous Connective tissue, the latter, derived chiefly from the pia mater, closely invest- 

 ing it without. 



