THE MUSCULATURE OF THE TRUNK. 



313 



wliicli overlies the depressor coccygis, and one that 

 is devoted to pulling the tail downwards and out- 

 wards, and by an equal contraction of the muscle of 

 the opposite side, directly downwards. 



cL-icLp7u^cLgrrv. 



Fig. 75. — An anterior portion of the trunk of a Raven, with the sternum, muscles, 

 and other parts extensively cut away in order to show the rudimentary 

 muscles of the diaphragm. The heart is pushed somewhat forward, and 

 tensely covered by its membranes, &c. The dissecting-chains pull the 

 lateral chest- walls apart. Life-size, by the author, from his own 

 dissections. 



It arises from the lower half of the posterior border 

 of the ischium, and from the entire posterior border of 



