97 



17. M. tricipiti accessor ius, 0*57 oz. 



This muscle is superficial, and has its origin in the fascia underlying 



the skin of the back of the arm — it aids the triceps, and also braces up 

 the skin of the back of the arm. 



18. M. anconeus, . . 0-23 oz. Fig- 17. 



Origin ; back of inner con- 

 dyle. 



Insertion ; inner side of 

 olecranon process. 



19. M. biceps humeri, . 1'20 oz. 



20. M. brachialis externus = Su- 

 pinator radii longus, 



0-20 oz. 



Origin ; line on humerus 

 in continuation of that 

 of the insertion of teres 

 superior. 



Insertion ; anterior supe- 

 rior crest of radius {sty- 

 loid process), by means 

 of strong twisted ten- 

 dinous fascia. 



21. M. brachialis anticus, 



0-35 grs. 



Origin ; whole outer sur- 

 face of humerus, below 

 the insertion of teres su- 

 perior (Mg. 17, e), and 

 origin of brachialis ex- 

 ternus. 



Insertion ; upper and back 

 side of ulna, on a line 

 level with the insertion 

 of the biceps into the tu- 

 bercle of the radius. 

 2. Pronators, . . . 1*55 oz. 

 viz., I. Pronator radii teres, 



2. Flexor carpi radialis, 



3. Flexor communis, di- 



git or um. 

 These have their origin from 

 the inner condyle of the 

 humerus. 

 23. Flexors of wrist, having 

 their origin from the olecranon 



process, 1.63 oz. 



viz. 



E. I. A. PROC. VOL. IX. O 



OUTER SIDE OF LEFT ANTERIOR LIMB OF THE SEAL. 



a, Origin of teres inferior. 



b, One of the scapular origins of triceps. 



c, Origin of teres superior. 



cl, Insertion of levator anguli posterioris scapulce. 

 e, „ teres inferior. 



