APPENDIX. 



Table of Effects of Excitation of the Dorsal (Afferent) and Ventral (Efferent) 

 Roots of some of the Spinal Nerves in Macacus rhesus. 1 



DORSAL ROOTS. 



Fourteenth post-thoracic. Tail lifted and 

 generally moved laterally, very often 

 toward the opposite side ; no move- 

 ment of arms or of limb. 



Thirteenth post-thoracic. Tail lifted and 

 generally moved laterally, very often 

 toward opposite side ; no movement of 

 arms or of limb. 



Twelfth post-thoracic. Tail moved, very 

 often toward opposite side ; no move- 

 ment of arms or of limb. 



Eleventh post-thoracic. Tail moved, very 

 often toward opposite side ; no move- 

 ment of arms or of limb. 



Tenth post-thoracic. Tail moved, often 

 to opposite side ; protrusion of anus ; 

 no movement in the limb proper. 



Ninth post-thoracic. Tail moved, less 

 commonly to the opposite side ; pro- 

 trusion of anus ; flexion of hallux, less 

 frequently of other digits as well. It 

 makes no difference to this movement 

 whether the plexus be post-fixed or not. 



Eighth post - thoracic. Tail moved to 

 same side ; protrusion of anus. The 

 anal movement obtained from this and 

 the two preceding roots is almost always 

 protrusion, and rarely shows more than 

 a trace of unilaterality, so that here 

 again must occur a cross -path of low 

 resistance athwart the median plane of 

 the cord. 



Flexion and adduction of hallux and 

 flexion of other digits ; slight flexion of 

 knee (contraction of hamstring) ; slight 

 plantar flexion of ankle (in one experi- 

 ment this was bilateral, but more 

 vigorous on the same side than on the 

 crossed). When all the reflexes have 

 been abolished by pushing the chloro- 

 form, the hallux reflex is usually the 

 earliest to return. 



Seventh post-thoracic. Tail moved to 

 same side ; flexion of knee ; flexion of 

 hallux and digits, especially of hallux 

 and second toe ; dorso-flexion of ankle 

 (very rarely plantar flexion). When 



VENTRAL ROOTS. 



Tenth post-thoracic. Tail moved laterally 

 toward the side of excitation. 



Ninth post-thoracic. Tail moved laterally. 

 In some individuals slight external rota- 

 tion of thigh, and adduction -flexion of 

 hallux and toes ; contraction of bladder. 



Eighth post-thoracic. Tail moved laterally ; 

 slight external rotation at hip and 

 flexion at knee, with extension at hip 

 and ankle ; strong flexion of digits, 

 with flexion-adduction of hallux ; move- 

 ment of arms ; contraction of bladder. 



Seventh post-thoracic. Extension of hip ; 

 flexion at knee ; extension at ankle ; 

 inversion of sole; strong flexion-ad- 

 duction of hallux ; depression of tail ; 

 movement of arms. 



1 Sherrington, Journ. Physiol., Cambridge and London, 1892, vol. xiii. ; Phil. Trans., 

 London, 1896. 



