THE EXTERNAL ROTATORS OF THE THIGH 



355 



1. PYRIFORMIS 



Tlie pyriformis — named from its pear .shape ( p^V??.? = pear) — is a thick 

 trian^-ular sheet. 



Origin.— (Ij The side of the front of the sacrum between and to the outer side 



Fig. 288.— The External Kotatous and the Hamstring Muscles. 



Gluteus medius 



Pyriformia 

 Gemellus superior 



Gemellus inferior 

 Quadratus femoris 



Gluteus maiimus 



Vastus externus 



Biceps — 



Crureus 



Short head of biceps 



Plantaris 



OaatrocnemiuE 



Obturator internus 



Adductor magnus 



Semi-tendinosus 



Semi -mem bran osus 



Sartorius 



Semi-tendinosus 



of the first, second, third, and fourth foramina; (1) the deep surface of the great 

 sacro-seiatic hgament; (3) the posterior border of the hip bone at the ui.i)er^)art 

 of the great sacro-sciatie notch. 



Insertion. — A small facet upon the front and inner aspect of the upper border 

 of the greater trochanter. 



