6. M. levator anguli scapula, 2± oz. 



Origin, from the fascia in the upper part of side of neck. 

 Insertion, into the anterior extremity of the vertebral edge of the 

 scapula. 



7. M. serratus magnus, . . . . . . . 2 Of oz. 



8. M. rhomboideus major, 7f oz. 



This muscle is inserted into the vertebral edge of the scapula, and 

 rotates it in a direction opposite to that of the serratus magnus, 



9. M. rhomboideus minor, ■ -J oz. 



This muscle, though rudimentary, is distinct. 



10. M. supraspinatus, 14 J oz* 



11. M. infraspinatus, ............. 13 oz. 



12. M. subscapulars, 14 J oz. 



13. M. triceps, . . . 43i oz. 



2 



14. M. teres major, 9± oz. 



Origin, whole posterior edge of the scapula. 



Insertion, into the middle third of the humerus, by means of a flat 

 tendon. 



15. M. latissimus dorsi, 25 \ oz. 



This vast sheet of muscle is inserted into the middle of the tendon of 

 the teres major, at four inches distant from the humerus. 



16. M. biceps, 8 oz. 



17. M. braehialis extemus, 4 oz. 



18. Jf. coraco-brachialis, . . \ oz. 



This muscle is rudimentary, but regular, and possesses a long tendon, 



also rudimentary. 



Paet IV Muscles of Mastication. 



1. M. masseter. 



This muscle is divided into two distinct portions ; one external, with 

 fan-shaped fibres radiating from the angle of the jaw, and more or less 

 horizontal; and the other internal, with vertical fibres, arising from 

 the whole internal surface of the zygoma, and inserted into the masse- 

 teric cavity of the ramus. 



The external, or horizontal portion, weighs 1 1 oz. 



The internal, or vertical portion ......... 



The second portion of the masseter is a direct closer of the mouth. 

 2. M. temporalis. 



The temporal muscle is also divided into two ; one superficial, 

 arising partly from the superficial fascia, and partly from the margin of 

 the temporal fossa, behind the ear, and from the back of the orbit ; thi3 

 portion, in passing downwards to the coronoid process, becomes blended 

 with the internal portion of the masseter on the outer side, and with the 

 second portion of the temporal -on the inner side.* 



* This superficial portion of the temporal muscle is well seen in the Otter, in which 

 animal it is better separated from the masseter, and from the true temporal, than in 

 the Lion. 



