CHAPTER V 

 MUSCLES OF THE RIGHT SUPERIOR LIMB 



Attention should be directed primarily to the anatomy, 

 relations, and mechanics of muscles and bones in this section. 

 Their innervation and blood supply will be studied in Chapter 

 VII, for which this dissected hmb will serve as a guide. A 

 thorough review of the general anatomy and relations of the 

 back of the skull, cervical, thoracic, and lumbar vertebrae, 

 ribs, sternum and bones of the pectoral girdle and limb should 

 be made at this time and special stress should be placed on 

 the topography of the scapula, humerus, radius, and ulna. 

 Although there is a marked difference in the form of these 

 bones in the rabbit and in man most of the elevations, depres- 

 sions, and other points of contour are comparable and subserve 

 similar purposes, such as, the spine of the scapula. Failure to 

 learn the topography of these bones is certain to result in the 

 explanations of origin, insertion, relations, and functions of the 

 muscles being quite unintelUgible to the student. 



An attempt has been made in this work to give the main 

 origin and insertion and principal functions of the muscles in 

 concrete form for the convenience of ready reference. The 

 student should deduce the various possible functions of each 

 muscle from its relations as he dissects it, but he should by all 

 means avoid committing the descriptions to memory. If he 

 will remember that a muscle, Uke a piece of elastic, functions 

 only by contracting — never by extending — he can readily grasp 

 the mechanical relation between the two attachments (origin 

 and insertion), the course of the muscle or its tendons and the 

 function of the muscle. The order of dissection of the muscles 

 selected in this manual is based upon the availability of the 



46 



