276 



Insertion ; by a long tendon into the greater tuberosity. 



12. M. rhomboideus, 0*02 oz. 



Origin ; from spinous processes of the last cervical and the first 



dorsal vertebra. 

 Insertion ; under surface of vertebral edge of scapula. 



13. M. serratus magnus, 0-26 oz. 



Origin ; from the transverse processes of the vertebrae, from 2nd to 

 8th, inclusive. 



Insertion ; all round the edge of acromion, and anterior and verte- 

 bral edge of the scapula. 



This muscle is continuous with the next, which may be regarded as 

 equivalent to the scapulocostal latissimus dorsi muscle found in the 

 Seal. 



1 4. M. latissimus dorsi scapulocostal, . . , . . . . 0-15 oz. 



Origin ; from the ribs of the 9th to 1 4th vertebras, inclusive. 

 Insertion ; into the posterior edge of the scapula. 



15. M. triceps, 0*25 oz. 



Origin, threefold : — 



1 . From the posterior edge of the scapula, near the glenoid ; 



2. By a bifurcate tendon from the coracoid and scapula, allowing 



the subscapulars to pass between the two tendons. 



3. Prom the outer and inner surfaces of the back of the humerus. 



16. M. suhscapularis, 0*05 oz. 



Origin ; from the inner surface and anterior edge of the scapula. 

 Insertion ; into the lesser tuberosity, and into the line leading from 

 it down the inner side of the arm. 



17. M, biceps humeri, ....... 0-03 oz. 



Origin ; from the inner side of the anterior edge of the coracoid, in 



front of the glenoid. 

 Insertion ; into the radius. 



18. M. brachialis externus, . . 0*03 oz. 



Origin; from the line outside and below the pectoral ridge. 

 Insertion ; into the radius, outside the insertion of the biceps, the 

 tendon of the brachialis anticus lying between them. 



19. M. brachialis anticus, 0*02 oz. 



This muscle is inserted into the radius, between the insertions of 



the biceps and brachialis externus. 



20. M. extensor carpi radialis, 0*01 oz. 



21. M. supinator radii longus, 0-02 oz. 



22. M. extensor digitorum communis, 0'01 oz. 



23. M. anconeus, 0-01 oz. 



Origin ; from the outer condyle of the humerus. 



Insertion ; into the ulna, along the whole length of its outer side. 



24. M. extensor carpi, 0*04 oz. 



Origin, from the radius and ulna, and from the interosseous septum. 

 Insertion; into the middle carpal bone. 



