94 Miss M. P. FitzGerald. The Lumbosacral-coccygeal [June 17 y 



(a) Areas of the Cross-sections of the Spinal Coral. (C.) 

 Table I. — Areas of the Cross-sections of the Cord (Charts I and II). 



Kegion of cord. 



Distance in cm. 

 from uppermost 



section of 

 I Lumbar region. 



Planimeter 

 measurement 

 in sq. cm. 



Actual area 

 as calculated 

 in sq. mm. 



Mean. 



Dorsal (thoracic) 



VI 



XII 



Lumbar — 



f Upper . 

 I i Middle 

 [ Lower . 



{Upper . 

 Middle 

 Lower . 

 (" Upper . . 

 III-l Middle 

 I Lower .. 



{Upper . . 

 Middle 

 Lower ., 

 f Upper . . 

 V < Middle 

 I Lower .. 

 f Upper . . 

 VI < Middle 

 L Lower . . 

 f Upper . . 

 VII < Middle 

 I Lower . . 

 Sacral — 



f Upper . . 

 1-^ Middle 

 [ Lower .. 

 f Upper . . 

 II < Middle 

 |_ Lower .. 

 f Upper .. 



III i Middle 



|_ Lower . . 

 f Upper . . 



IV < Middle 

 [Lower .. 



Coccygeal — 



(" Upper . . 

 I < Middle 

 [ Lower . . 

 f Upper . . 

 II -j Middle 

 L Lower . . 

 f Upper . . 

 Ill i Middle 

 [Lower .. 



0-142 

 0-268 

 0-608 

 0-846 



•058 

 •302 

 •558 

 •681 

 •918 

 •064 

 ■244 

 2 -484 

 2 608 

 2 -794 



2 -944 



3 -154 

 3-205 

 3-328 

 3 -450 

 3 -557 



3 -642 



3-782 



3- 906 



4- 057 

 4-197 

 4-316 



4 -509 

 4-623 

 4-723 



4 "858 

 4-974 



5 -138 

 5 -312 



486 

 622 

 726 

 847 

 939 

 058 

 6-174 

 6-278 

 6 -331 



39 -04 

 45 -82 



50 -94 



50 -64 



51 -58 

 55 -22 

 55 -46 



59 -40 



60 -42 



59 -66 



60 -30 

 72 -86 



77 -58 

 79 -50 



78 -00 

 74-40 

 72 -60 

 63 -64 

 60 -06 

 49 -32 

 45 -66 

 42 -32 

 38 -48 



33 -50 

 31 -44 

 27 -38 

 25 -86 



23 14 

 20 -10 

 19 -20 

 17 -44 

 15 -08 

 14 -20 

 13 -40 

 12 -30 



10 -76 

 9 -56 

 8 -52 



24 -08 

 22 -18 

 17 -04 



3 -34 

 10 -34 

 2-09 



9-76 



11 -46 



12 -74 

 12 -66 



12 -90 

 13-81 



13 -87 



14 -85 



15 -11 



14 -92 



15 -08 



18 -22 



19 -40 

 19 -88 

 19 -50 

 18 -60 

 18 -15 

 15 -91 

 15 -02 

 12 -33 

 11 -42 

 10 -58 



9-620 



8-375 

 7-860 

 6-845 

 6 -465 

 6-785 

 5 -025 

 4-800 

 4-360 

 3-770 

 3 -550 

 3 -350 

 3-075 



2-690 

 2 -390 

 2 -130 

 1 -505 

 1 -386 

 • 1 -065 

 '8350 

 -6462 

 -5225 



12 -76 



14 -17 



15 -03 

 19 -16 

 18 -75 

 14-42 

 10 -54 



7-693 

 5-758 

 4-310 

 3 -325 



2 -403 

 1-319 

 -6679 



The section area of the spinal cord (C) (Charts I, II, Table I) increases 

 from the region of the first lumbar to the lower portion of that of the 

 fourth lumbar nerve, where the maximum size of the lumbar enlargement is 

 reached (19 - 88 sq. mm.). 



