100 Miss M. P. FitzGerald. The Lumbosacral-coccygeal [June 17, 



(d) Section Area of the Dorsal Columns. (P.) 

 Table IV. — Section Area of the Dorsal Columns (Charts II and VII). 



Region of cord. 



Distance in cm. 

 from uppermost 



section of 

 I Lumbar region. 



Planimeter 

 measurement 

 in sq. cm. 



Actual area 

 as calculated 

 in sq. mm. 





8 "84 



2 '210 





10-46 



2 -615 



"142 



11 -24 



2 -810 



'268 



11 -68 



2 -920 



"608 



11 '82 



2 -955 



"846 



12 "52 



3 -130 



1 - 058 



12 -22 



3 -055 



1 -302 



12-92 



3 -230 



1 -558 



13 -18 



3 -295 



1 -681 



12 -72 



3 -180 



1 '918 



12 -44 



3 -110 



2 "064 



14 '44 



3 -610 



2 "244 



13 -94 



3 -485 



2-484 



13-72 



3 -430 



2 -608 



13 -06 



3 -265 



2 "794 



11 -46 



2 -865 



2 -944 



10 -90 



2 -725 



3 -154 



8 -56 



2 -140 



3 -205 



8 -28 



2 070 



3 -328 



6 -68 



1 -670 



3 -450 



6 -06 



1 -515 



3 '557 



5 -54 



1 -385 



3 -642 



5 -02 



1 -255 



3 -782 



4 -08 



1 -020 



3-906 



3-68 



-9200 



4-057 



3 -06 



-7650 



4-197 



2-92 



0-7300 



4-316 



2-78 



-6950 



4-509 



2 -44 



-6100 



4-623 



2 -24 



-5600 



4-723 



2 -20 



-5500 



4-858 



1 -78 



-4450 



4-974 



1 "64 



-4100 



5-138 



1 -54 



-3850 



5 -312 



1 -46 



-3650 



5-486 



1 -08 



-2700 



5-622 



1 -02 



-2550 



5-726 



0-82 



-2050 



5-847 



2-36 



-1475 



5-939 



2 -22 



-1387 



6-058 



1 -62 



0-1012 



6-174 



0-27 



-0675 



6-278 



0-78 



0-0487 



6-331 



0-17 



-0425 



Dorsal (thoracic) — 



VI 



XII 



Lumbar — 



f Upper 



li Middle .. 

 L Lower 



{Upper 

 Middle .. 

 Lower 



f Upper 



III 1 Middle .. 



[ Lower 



f Upper 



IV < Middle .. 



[ Lower 



(" Upper 



V^ Middle .. 

 I Lower 



{Upper 

 Middle .. 

 Lower 



{Upper 

 Middle .. 

 Lower 



Sacral— 



{Upper 

 Middle .. 

 Lower 



(" Upper 



II -l Middle .. 

 [ Lower 



{Upper 

 Middle .. 

 Lower 



(~ Upper 



IV < Middle .. 



[ Lower 



Coccygeal — 



f Upper 



I-j Middle .. 



|_ Lower 



f Upper 



II -l Middle .. 

 [ Lower 



{Upper 

 Middle .. 

 Lower 



30 J 



The decrease in the section area of the dorsal columns is much more rapid 

 than the increase, and, beginning in the fourth lumbar region, is continuous 



