TABLE 7 



Shoiving the average cross-sectional area of gray matter in the various regions, and the 



relative amounts of the anterior and posterior horns 



Cervical V, VI, 

 VII, VIII... . 



Thoraolf. 



Lumbar. 



IArea of gray matter 

 (sq. mm.) 

 (%) Ant. horn 



[(%) Post, horn 



IArea of gray matter 

 (sq. mm.) 

 (%) Ant. horn 

 (%) Post, horn 



IArea of gray matter 

 (sq. mm.) 

 (%) Ant. horn 

 (%) Post, horn 



II mm. 17 mm. 31 mm. 65 mm. 150mm. 



0.201 

 74.63 

 25.37 



1142 

 79.58 

 20.42 



0.621 

 69.40 

 30.60 



0.454 

 72.03 

 27.97 



0.515 

 73.59 

 26.41 



0.893 

 58.45 

 41.55 



0.460 

 58.69 

 41.31 



0.790 

 56.58 

 43.42 



0.924 

 62.45 

 37.55 



0.625 

 64.48 

 35.52 



1.326 

 57,16 

 42.84 



3.867 

 54.69 

 45.31 



1.382 

 53.62 

 46.38 



3.165 

 55.04 

 44.96 



CHILD ADULT 



(Stilling) 



14.55 



17.89 

 58.80 

 41.20 



5.36 

 49.16 

 50.84 



14.41 

 52.80 

 47.20 



TABLE 8 



Showing the average cross-sectional area of white matter in the various regions, am 



the relative amounts of the anterior, lateral, and posterior columns 



Cervical V, 

 VII, VIII.. 



VI, 



Thoracic . 



Lumbar . 



fArea of white matter 

 (sq. mm.) 

 (%) Post, column 



(%) Lat. column 



(%) Ant. column. . . . 

 Area of white matter 



(sq. mm.) 



(%) Post, column 



(%) Lat. column 



(%) ant. column 



Area of white matterj 



(sq. mm.) 



(%) Post, column 



(%) Lat. column 



(%) Ant. column 



11mm. 17mm. 31mm. 65mm. 150mm 



0.082 

 36.59 



63.41 



0.050 

 38.00 



62.00 



0.357 

 20.45 

 59.38 

 20.17 



0.245 

 20.41 

 60.00 

 10.59 



0.571 

 35.20 

 51.14 

 13.66 



0.336 

 35.71 

 51.49 

 12.80 



0.701 

 28.10 

 48.08 

 23.82 



0.453 

 26.27 

 46.14 

 27.59 



0.279j 0.444 0.910 



20.43 26.80 31.65 



56.99 1 53.40 47.47 



22.58 I 19.80 20.88 



3.019 

 25.55 

 41.75 

 32.70 



1.387 

 32.30 

 45.93 

 21.77 



2.321 

 34.38 

 40.84 

 24.78 



CHILD ADULT 



(Staling) 



23.47 



TABLE 9 



Absolute and relative volumes of white matter, of gray matter, and of ependyma with 



the canal in various regions of the cord in the 11 mm. and 17 mm. embryos 



62 



