STRUCTURE OF SPINAL CORD 



4o: 



cornua, the one directed forwards being the anterior 

 COrnu (Fig. 143, e e) ; the one turned' backwards the 

 posterior cornu (Fig. 143, a a). The convex sides of 



Fio. 143. — Transverse Section of one-half of the Spinal Cord (in 

 THE Lumbar Region), magnified. 



1, anterior fissure; 2. posterior fissure; 3, central canal; 4, and 5, 

 bridges connecting the two halves (posterior and anterior commissures) ; 

 G, posterior column ; 7, lateral column ; 8, anterior column ; 9, posterior 

 root ; 10, anterior root of nerve. 



a a, posterior horn of grey matter ; c c e, anterior horn of grey matter. 

 Through the several columns I3, 7, and 8, each comjiosed of white matter, 

 are seen the prolongations of the pia mater, which carry blood-vessels 

 into the cord from the outside. The pia mater itself is seen over the 

 whole of the cord. 



