496 



2. M. rhomb oideus, 0*12 ") Aln 



„ ....... o-n } • • °' 12oz - 



Arises from the third rib, and space between it and second rib ; and is 

 inserted into the under surface of the posterior third of the scapula ; 

 its fibres slant backwards. 



3. M. latissimus dor si et teres major, . . . 0*13 1 0 # 14oz 



„ ... 0-15 j * ° Z * 



Occupies its usual position, passing over the posterior border of the 

 scapula, and has also a subcutaneous origin ; the lat. dorsi arises from 

 the fourth rib, and forms the posterior slip of the whole conjoined 

 muscle ; the teres major arises from the outer side of the posterior half 

 of the scapula. These muscles are inserted by a common tendon into 

 their usual place at the back of the humerus. 



4. M. pectoralis (major et minor), .... 0*05) n M 



.... 0-09/ * ' UU7 0Z ' 



This sheet of muscle takes origin from the front and edge of the 

 sternum and from the sternal ribs (two inches), and has the usual in- 

 sertion ; it is an adductor humeri. 



5. M. pectoralis secundus, 0*09 A 



* „ 0-04 • • °' 065 oz ' 



Arises in a thin sheet from the lower border of the acromion, from the 

 surface of the clavicle, and from the coraco- clavicular membrane, and 

 terminates in a tendon passing over the groove in the upper end of the 

 coracoid, to be inserted into the top of the pectoral ridge of the 

 humerus ; — it is a levator humeri. 



6. M. deltoideus. 0-05) A Acc 



0-08 }■ • 0 065 oz - 



Arises from the acromial end of the scapula, at the coraco scapular line 

 of junction, and is inserted into the outer side of the pectoral ridge. 



7. M. coraco-brachialis, 0'05 oz. 



Arises from the outer edge of the coracoid, and is inserted into the 

 upper and inner fourth of the back of the humerus. 



8. M. triceps humeri, 0*051 nncc 



; o-os 1 • • °-° 65oz - 



Has three heads — 



a. cutaneous {panniculus carnosus). 



/3. long head from scapula in usual place. 



y. fleshy, from the inner and back side of the humerus. 



9. M. supra et infra spinatus^ 0*01 \ A n1 



0-01/ * ' U ' U10Z ' 



Arises from one inch of the lower edge of scapula, close to glenoid, and 



