ON THE MAMMALIAN NERVOUS SYSTEM. 521 



APPENDIX A.- Topographical Relations existing between the Superficial Origins from 

 the Spinal Cord of the Spinal Nerves, and the Bodies of the Vertebrae in the Cat. 



CERVICAL NEKVK. CORRESPONDING VERTEBRA. 



, I Upper border of 1st cervical 



II Upper half of 2nd cervical 



III. . Middle of 3rd cervical* 



IV Upper border of 4th cervical* 



V Intervertebral disc between 4th and 5th cervical 



VI Lower border of 5th cervical and disc between 5th and 6th 



cervical 



VII Lower half of 6th cervical 



VIII Centre of 7th cervical 



DORSAL. 



I Disc between 7th cervical and 1st dorsal 



II Lower border of 1st dorsal and disc between 1st and 2nd dorsal 



III Lower half of 2nd dorsal 



IV Lower half of 3rd dorsal 



V Lower two-thirds of 4th dorsal 



VI Centre of body of 5th dorsal 



VII Lower half of 6th dorsal, and disc between 6th and 7th dorsal 



VIII Lower half of 7th dorsal, and disc between 7th and 8th dorsal 



IX Disc between 8th and 9th dorsal 



X Intervertebral disc between 9th and 10th dorsal 



XI Upper half of body of llth dorsal 



XII Middle of body of 12th dorsal 



XIII Lower half of body of 13th dorsal 



LUMBAR. 



I Lower half of 1st lumbar, and disc between 1st and 2nd lumbarf 



II Lower quarter of 2nd lumbar, and disc and upper quarter of 



the 3rd lumbar centre opposite discf 



III Disc between 3rd and 4th lumbar 



IV Lower border of 4th lumbar 



V Middle of 5th lumbar 



VI Lower quarter of 5th lumbar and disc between 5th and 6tu 



VII Upper fourth of 6th lumbar 



BACEAL. 



1 2nd fourth of 6th lumbar 



II 3rd fourth of 6th lumbar 



III Disc between 6th and 7th lumbar 



COCCYGEAL. The cord tapers gradually to 3rd sacral vertebra. 



* These nerves consequently run slightly forwards from the cord to leave the intervertebral 

 foramina. 



t These nerves are directed slightly forwards on leaving the cord. 

 MUCCCXCI. B. 3 X 



