92 



VETERINARY PHYSIOLOGY 



Peripheral Reflexes. 



There is evidence that reflex action occurs in groups of 

 neurons outside the spinal cord in connection with the 

 viscera. 



External rotators of hip. 

 Hamstrings. 



Calf muscles and extrinsic muscles 

 of foot. 



Intrinsic muscles of foot. 



Muscles of bladder and urethra. 

 Extrinsic muscles of foot. 

 Intrinsic muscles of foot. 



Levator and sphincter ani. 



Fig. 40. —The Groups of Cells in the Anterior Horn of grey matter at the 

 level of the •2nd, 3rd, and 4th sacral nerves, as determined by the 

 degenerations which follow amputation. (From Bruce.) 



1. The Myenteric Plexus. — The terminal plexus in the 

 wall of the alimentary canal acts reflexly to produce the 

 characteristic movements by which the contents are churned 

 up and driven down the gut (p. 332). 



Ficj. 41. To show the possible Axon Reflex in connection with the bladder. 



I.M.G., the inferior mesenteric ganglion ; H.N., the hypogastric 

 nerve ; B., the bladder. 



