1884.] ANATOMY OF SCOPUS UMBRETTA. ^l47 



is contimipcl without any change to the radial aponeurosis ; the 

 inner tendon about half way down gives off in front a broad, thin, 

 flat tendon, which passes down parallel to the other half of the 

 tendon and is inserted near to it ; at this ])oint it receives the slip from 

 the tendon of the tensor patagii longus already referred to. There 

 is no biceps slip to the patagium. 



13. The biceps has the usual double origin, and is inserted on to 

 the radial margin of the ulna and on to the ulnar margin of the 

 radius. 



14. The anconeus lonffus arises from the scapula close to the arti- 

 culation of the humerus by a single head, the outer half of which is 

 tendinous about half an inch from the origin ; it gives off a broad 

 flat tendon to the outer edge of the humerus ; it ends below in a 

 long stout tendon attached to the anterior border of the olecranon 

 process of the ulna. 



] 5. The triceps arises from the head of the humerus just external 

 to the insertion of the teres and from a considerable proportion of 

 the shaft ; it blends with the anconeus longus at its insertion on to 

 the ulna behind the latter. 



The expansor secundariorum appears to be absent. 



16. The pronator radii svperjicialis arises from the inner condyle 

 of the humerus ; it is inserted into the upper margin of the radius. 



17. The pronator radii profundus, twice as large as the last, 

 arises from the humerus below it ; it is inserted ou to the radius below 

 the insertion of the last, and extends considerably beyond. Between 

 the two pronators is a small muscle which arises in common with 

 the pronator profundus ; it is attached partly to the tendinous sur- 

 face of the latter and partly by a slender tendon to the radius. 



18. The flexor carpi idnaris \s a, strowg muscle arising by fleshy 

 origin from distal extremity of humerus ; it is Inserted by a long 

 thick tendon on to the ulnar carpal bone. 



1 9. The external anconeus arises from the common tendon from the 

 external condyle of humerus ; it is inserted into the proximal one 

 half of the upper part of the ulna (except at the extreme end). 



20. The extensor carpi ulnaris arises from a long tendon from 

 outer condyle of humerus together with the anconeus externus, and 

 from the tendinous septum between it and the latter ; it is inserted 

 by a long tendon about one third of the way down the metacarpal 

 of digit II. on the outer inferior margin. 



21. The extensores carpi radialis longus and hrevis arise from 

 the outer condyle of humerus above all the other muscles of the 

 forearm ; they are in close contact for the whole of their length, 

 and are inserted on to the tuberosity of the metacarpal of the first 

 digit- 



22. The extensor commtinis digitorum arises from the outer con- 

 dyle of the humerus above and a little behind the extensor carpi 

 ulnaris ; it divides at the base of the thumb into two tendons, the 

 first of which is attached to the digital margin of the phalanx of the 

 pollex ; the other is similarly attached to the second phalanx of 

 digit II. 



