234 



THE UPPER LIMB IN MAN. 



ature of that portion of the neck from which the limb is 

 developed. This is about the lower cervical and upper 



Fig. 4. 

 Outline diagram of a Bird. 



Tig. 5. 



Outline diagram of an Ape in its so-called 

 erect position. 



dorsal region, and the limb is developed at right angles to the 

 vertebral axis. In man there is not such a curvature back- 

 wards of the lower part of the neck as in the other mammalia. 



2d. For the transverse obliquity — the lateral compres- 

 sion of its thorax — which again, by bringing the quadrupedal 

 scapulas close together anteriorly, constitutes one of the con- 

 ditions of the locomotory function of the limb. 



d. The human scapulas lie on the neural aspect of the 

 thorax ; the scapulas of the animal on its lateral aspects. 



c. In no animal does the scapula present platelike expan- 

 sions and margins, comparatively so extended as in man, and 

 in no animal are the spine of the scapula and the acromion 

 so fully developed as in man. 



/. In no animal is the coracoid portion of the scapula 

 proportionately so fully developed as in man. The coracoid 

 process is comparatively more massive and curved in man ; 

 and in addition, the coracoid portion of the glenoid articular 

 surface, which carries the humerus in full extension, is only 

 fully developed in man. 



