////; SPINAL con i) 



7f)9 



enlargement. The .spinal nerves attached in these regions are of preater size 



t h:m in i)t her regions. 



The cervical enlargement lie.irins with the third cervical vertebra, acquires its 

 greatest breadt h ( !'_' to 14 nun.) opposite 1 lie lower purl of t he lift li cervical vertebra 

 (origin of the sixth cervical nerves), and extends to opposite the second thoracic 

 vertebra. I'nlike the lumbar enlargement, its lateral is noticeably greater than its 

 dorso-vent ral diameter. 



IMC. ">(><>. DIMWIXI: I-;CIM SI-MCIMKX simwivc, CM D.I K<jri.\A, THE BEGINNING or CURTAIN OF 

 mi: SIMXAI, XKKVKS \\IIK n IUKM i r, AND us ACCOMPANYING Dru.v MATKU. (Dur.sal asjif. 



:.i MATI:I: ,v/v.v.i LIS 



J-:.\/..U:<;/:MI:.\T 



COXCS MEDl'LLARIS 



-_y FILVM TK11M1XALE 



SPIXAL G. I XI i I.I A 



OOCCYOSAl /-/'. i.i//:vy 1/71. r.v 



/>!/:.! M.I u;/,-. .SV/.V.I/./M 



The lumbar cnlarsrement l>esrins srradnally with the ninth or tenth thoracic ver- 

 tebra, is most marked at the twelfth thoracic vertelira (origin of the fourth lumbar 

 nerves), and rapidly diminishes into the conns medullaris. 



Hoth the lumbar and thoracic regions are practically circular in transverse sec 

 tion. Neither diameter of the lumbar is ever so great as the lateral diameter of 

 the cervical enlargement. The thoracic part attains its .smallest diameter opposite 



