THE SPINAL CORD 



683 



voked by touching the conjunctiva; (2) the pupil reflexes, by throwing 

 light on the eye, or getting the subject to accommodate by looking 

 *t a near object. 



FIG. 409. To SHOW INTERACTION OF CERTAIN GROUPS OF REFLEX PATHS UPON THB 

 FINAL COMMON PATH (FC). 



-5, Scratch receptor; e and / are extensor and flexor muscles of knee respectively. 

 Reflexes that act as allied reflexes on FC are represented as having their ter- 

 minals joined together. Reflexes with excitatory effect { + ) are brought to- 

 gether on the left, those with inhibitory ( ) on the right. (From Sherrington's 

 " Integrative Action of the Nervous System," by permission of Yale University 

 Press and Messrs. Constable and Co., Ltd.) 



Various other reflexes may also be evoked. Such reflexes show 

 that the reflex arc concerned is intact. If there be no response, 

 there is damage to the arc in some part of its course. 



