RELATION BETWEEN STRUCTURE AND FUNCTION. 



The range of the spinal innervation of the skin and the 

 muscles covering, and moved by and moving, the joints of 

 the upper limb, is shown in the accompanying conspectus. 

 The sensory innervation of the deep structures may be 

 looked on as similar in segmental range to the motor 

 innervation of the muscles. 





Thorax. 















Number of spinal 

 nerve-root - - 



iv iii ii i 



viii 



vii 



vi 



V 



iv 



iii 



xii 



xi 



X 



ix 



( skin - - 

 Shoulder \ 



( muscle - 



* 



* 



* 



X 



X 



X 



* 

 X 



* 

 X 



* 

 X 



* 



f skin- 







* 



* 



* 



* 



* 



* 







Elbow i 



muscle - 



flexors - 



V extensors 









X 

 X 



X 



? 



X 



X 

 X 

 X 



X 

 X 



? 



X 

 X 







( skin - - 









* 



* 



* 



* 









Wrist i 



muscle - 



flexors - 



\> extensors 







X 



? 



X 

 X 



? 



X 

 X 

 X 



X 

 X 

 X 



X 

 9 



X 









/ skin - - 









* 



* 



* 



* 









Fingers ■{ 



muscle - 

 flexors - 







X 

 X 



X 

 X 



X 

 X 



X 



X 



? 











V extensors 







? 



X 



X 



X 



? 









