285 



14. M. teres major, 0-80 oz. 



Origin; from the posterior inferior angle of the scapula. 

 Insertion ; with the latissimus dorsi, by means of a broad tendon, 



of which the teres forms two-thirds, and the latissimus one- 

 third. 



15. 31. teres minor, 0*15 oz. 



16. M. subscapular is, 1*45 oz. 



17. 31. biceps humeri, 1*57 oz. 



18. 31. coracobrachial, 0-12 oz. 



This muscle is intimately blended with the coracoid head of the 

 biceps. 



19. 31. brachialis anticus, 0-47 oz. 



20. M. pronator radii teres, 0'32 oz. 



21. 31. flexor carp i radialis, 0 • 3 7 oz . 



22. 31. palmaris longus, 0*18 oz. 



23. M. flexor sublimis digitorum, 0*77 oz. 



24. M. flexor carpi ulnaris, 0*73 oz. 



25. M. supinator radii long us, 0*77 oz. 



26. 31. extensor carpi radialis longior, 0*33 oz. 



27. M. extensor carpi radialis brevior, . 0*32 oz. 



28. If. extensor digitorum communis, . . 0*34 oz. 



29. M. auricularis, . 0-08 oz. 



This little muscle sends a tendon to the 4th as well as to the 5th 



finger. 



30. M. extensor carpi ulnaris, . . 0*28 oz. 



31. M. flexor digitorum prof undis, \ 



II. flexor pollicis longus, j" oz. 



There is no distinct flexor pollicis longus ; but a tendon branches 

 off to the thumb, from the central portion of the tendon of the 

 flexor digitorum profundus, that supplies the 3rd and 4th fin- 

 gers. I found by trial that the weights of equal lengths of the 

 thumb tendon and common tendon to the other four fingers 

 were as 116 to 243 ; showing that one-third of the whole force 

 of the muscle is expended on the thumb, and the remaining 

 two -thirds on the other fingers — for it is easy to see that the 

 forces acting along the subdivided tendons must be exactly pro- 

 portional to their strengths as measured by the weights of equal 

 lengths. 



The peculiarities of the human flexor pollicis longus have always 

 been insisted upon by anatomists as essentially characteristic 

 of Man, as distinguished from the Quadrumans ; but exceptions 

 of the most startling kind are occasionally met with. W hile I 

 was engaged in the dissection of the Macacus nemestrinus, I 

 called the attention of Mr. Einney, Medical Scholar of Trinity 

 College, to the arrangement of the tendons of the deep fiexor, 

 who then mentioned to me the case of a male subject dissected 



R. I. A. PEOC. VOL. IX. 2 Q, 



