DonaLpson AND Davis, Human Spinal Cord. 31 
TABLE VI. 
Areas of Cross-Sections of the Human Spinal Cord at Different Ages. 
The records for the cords at 1, 2 and 5 years are copied from 
STILLING. The record for the cord at maturity gives the aver- 
ages of his four tables of measurements on adults. 
Areas of White Substance. Areas of Gray Substance. 
sq. mm. sq. mm. 
Age. Age. 
Segment. Tyr. 2yrs. 5 yrs. Mature.|I yr. 2 yrs. 5 yrs. Mature. 
Cervical. 
I B04 0307/5 esa bn O2-O2) 07-07) 7h 4-2 meme UT 7.8 
II 28.98| 30.04 5B:p4 68.57| 4.60| 4.60|1_ 12-37 ite 
Ill 22.62| 23.33 32°75|) 72-37. 4-60] 4.60 11.25) 14.14 
IV 48.08) 41.36 34.65! 74.94] 18 03] 16.26 12.73| 16.52 
Vv 45-60] 41.36 42.02| 73.97| 21.21] 16.26 19.67| 19.70 
VI 46.31} 37.12 42.02} 79.18} 20.86] 20.85 19.67| 20.32 
VII 47-37| 43-83 40.39] 71.84] 18.03] 14.14 18,24] 20.38 
VIII 39.24] 46.66 33-99| 65.30) 16.97] 12.37 13.68] 15.99 
Thoracic. 
30.75] 30,04 28.59] 63.65] 6.01] 6.36 6.97] 11.66 
II 26.51} 26.51 24.12} 53-64] 6.72} 7.78 5-32] 9.01 
III 20.85} 28.99 24.12} 52.23] 4.95| 6.36 eel) AG /he7l 
IV 21.56] 26.16 ZANE 252222) beso eAsO5 5-32} 6.89 
V 22.98] 20.50 24.12] 50.10] 5.30) 6.01 5-32} 38.74 
VI 21.56| 22.98 24.12} 45.20| 4.60] 6.36 5-32| 8.04 
VII 19.44] 24.04 24.12| 47.43) 5.66) 5.30 5-32] 6.80 
Vill 20.86) 20.50 24.12] 45.15} 6.01] 5.30 5-32] 5-92 
IX 20 15| 20.85 23-83] 40.74] 5.66) 7.78 4-56] 7.33 
X 23.68] 16.97 23-83} 43-05] 4.95] 7.07 4.56) 7.71 
XI 23.68] 23.33 23.83] 41.40] 6.36) 7.07 4.56) 8.92 
XII 22.62} 20 85 21.74] 44.18] 7.42] 7-07 6.44] 10.14 
Lumbar. 
I 22.98) 28.33); (cp cat 44-00) 7:42]. +6.54 13.51 
i 22.62| 23.68 1 ese 49.6:| 10.96} 9.90 yee rae 
III 22.98) 19.09 21.15} 48.01] 14.85) 16.61 13.26] 23.59 
IV 23.33| 22.62 22.34) 43-3c! 15.20 15.91 21.02] 24.48 
Vv 20.15| 19.80 17.07| 43.4C] 17.68] 19.80 24.89] 25.01 
Sacral. 
I 22.62} 20.86] ° 17.18) 32.34] 15.91] 21.56 23.53| 24.47 
II 20.85| 13.79 17.26] 19.44] 18.38] 22.62 23.22| 17.41 
III 10.61] 10.61 9.87| 12.25] 15.20] 13.43 17.21] 12.19 
IV 10.61} 5.66 5-97, 8.30] 9.19] 8.84 10.81| 7.86 
Vv 3.89; 4.59 2.18) 4.77) 4:60) | 3:89 6.01; 6.36 
Coccygeal. 
I 1.06] 1.77 96, 2.38) 2.83) 2.47 2.70] 3.18 
Total 766.00] 741.97} 734-80/1455.07 312.53/318.48] 334.65] 410.93 
In order to compare the records in Table VI, we use the 
sums of the total areas of the section, obtained by adding the 
sums of the areas of the gray and white substance, which are 
tabulated separately. 
