TABLE 10 



Absolute and relative volu7nes of white matter, of gray matter, and of ependyma ivith 



the canal in various regions of the cord in the 31 mm. and 65 mm. embryos 



TABLE 11 



Absolute and relative volumes of white matter, of gray matter, and of ependymaivith 

 the canal in various regions of the cord in the 150 mm. embryo. 



r White matter 



Cervical. . . \ Gray matter 



[Canal and ependyma 

 r White matter 



Thoracic . . \ Gray matter 



[ Canal and ependyma 

 f White matter 



Lumbar. . . < Gray matter 



[Canal and ependyma 

 f White matter 



Sacral I Gray matter 



[Canal and ependyma 



TABLE 12 



Relative volumes of white matter and of gray matter in the various regions of the spinal 

 cord in a child of two years {Stilling) and in a composite adult {Donaldson and 

 Davis). 



63 



