CHAPTER II 



SUPERFICIAL DISSECTIONS 



OUTER ASPECT OF LIMB 



Such a dissection is represented in Plates IV. and V., and the 

 structures exposed are as follows : 



The Bones 



Near the upper end of the limb, the spine of the scapula (2) 

 is seen running obliquely downwards and forwards. Towards its 

 middle it shows the prominence called the tubercle of the spine (4), 

 which gives attachment to the trapezius muscle. This muscle has 

 been dissected away to expose the muscles lying beneath it. The 

 summit or anterior portion of the outer tuberosity of the humerus 

 (12) is visible, and to it the outer tendon of the supraspinatus 

 muscle (6) is attached. Extending downwards and backwards from 

 the summit is the deltoid ridge (13), which terminates inferiorly 

 in the well-marked deltoid tubercle. The ridge is partially concealed 

 by the insertion of the infraspinatus muscle (5). 



Taking an oblique course downwards and backwards along the 

 line of direction of the deltoid ridge, we arrive at the summit of 

 the olecranon process of the ulna, which forms a marked and well- 

 defined prominence (19). 



The bones of the forearm are almost completely clothed by the 

 extensor and flexor muscles of the metacarpus and digit. The 



B 



