488 



Takes its origin from the lower border of the ilium (postacetabular), 

 and from the upper margin of the ischium, round the ischiadic foramen, 

 and from the membrane of that foramen (?/), Fig. 28, ad. mg. The 



greater part of this muscle ^.^3-7 oz., is inserted by a strong flat 



tendon into the top of the linea aspera ; and the rest is digastric (be- 

 coming tendinous as it passes behind the hip joint), and inserted into 

 the linea aspera of the upper half of the thigh, as far down as the 

 commencement of the M. semi-membranoso accessorius ; it overlies the 

 adductor longus. 



6. M. obturator ext emus, 1 *4"> , e . 



L 1*55 oz. 



1-41 



1-7J • • 



This muscle (which probably corresponds with the obturator ex- 

 iernus of Mammals) arises from the inner surface of the bony rim 

 of the ischiadic foramen (y), and its tendon passes with that of the 

 obturator internus through the obturator tendinal foramen (x), and is 

 inserted, after receiving the tendon of the posterior gemellus, No. 7, into 

 the lower depression (Fig. 29. o. e.), marked on the outer side of the 

 head of the femur. 



7. M. gemellus posterior, 0*15 



0-2o}- • °' 180Z - 



Origin very small, and near the acetabulum, from the outer side of 

 the head of the obturator membrane (a). Both gemelli are found in the 

 Emu ; the posterior attaching itself to the tendon of the analogue 

 of the obturator externus, and the anterior to the tendon of the true ob- 

 turator internus, 



8. M. adductor longus, 2*1\ 0 - - 



....... 3-4/ * ' Z lb 0Z ' 



Arises from the lower border of the ischium (Fig. 28, ad. 1), below 

 the inferior margin of the adductor magnus ; and is inserted into the 

 inner edge of the condyloid pit of the femur, and into the crucial liga- 

 ment of the inner condyle. This muscle was originally double, and is 

 folded on itself ; its fibres were pale and fatty in both specimens. 



9. M. obturator internus, 2-5 



si}- • 2 ' 90oz - 



Arises from the inner side of the bony rim of the obturator foramen (z), 

 and from its membrane, and is inserted (Fig. 29, o. i.) into the upper 

 depression at the top of the back of the outer side of the head of 

 the femur. The anterior gemellus is included in the weight of the obtu- 

 rator internus. 



10. 31. agitator caudce et tensor vagina femoris, 1 1*91 15.35 oz 



18*8J 



This combined muscle takes its origin by fascia, from the superior 



