CHAPTER X. 



FOKMATION OF THE PUBO-FEMOKAL EEGION, 

 PELVIC FLOOE AND FASCIA. 



Inguinal and femoral hernia occur so rarely amongst mammals 

 generally that they may be considered human peculiarities. Their 



sacrum 



, sacrum 



/& mm 



'symphysis. 



A. 



symphysis. 



Fig. 106.— A. The form of Pelvis and Inguinal Canal in Man. 



B. The corresponding forms in the Lower Primates. 



frequency in man is due to certain structural changes in his 

 pubo-fenioral region, changes which have resulted mainly from his 

 adaptation to upright progression. His susceptibility to hernia 

 is due to : — 



(1) The unique form of Poupart's ligament in man. It is 



