282 PROF. ST.-GEORGE MIVAUT ON THE [Feb. 21, 



The suhscapularis is a strong muscle arising from the cartilage of 

 the first rib, and inserted into the outer part of the clavicle. 



The deltoid has a distinct clavicular portion, as well as that from 

 the metacromion and fascia investing the infraspinatus. 



The supraspinatus, infraspinatus, teres major, teres minor, and 

 suhscapularis are as in the Agouti'. 



The biceps has the usual two heads and radial hisertion. 



The coracobrachialis consists of two parts — one descending to the 

 middle of the humerus, the other down to the internal condyle. 



The hraehialis anticus takes origin from the back of the summit 

 of the shaft of the humerus, from the whole of its outer side, and 

 from its lower front part. It is inserted into the radial side of the 

 ulna by a strong tendon. 



The triceps has the usual three heads and the normal insertion. 



The supinator longus is very distinct, arising by delicate fascia 

 from the external condyloid ridge between the summit of the origin 

 of the extensor carpi radialis longior and the brachialis anticus. It 

 is inserted into the outer side of the styloid process of the radius. 



The supinator brevis arises from the annular ligament and shaft 

 of the radius as usual, and extends about halfway down the radius. 



The pronator radii teres is a very strong muscle, and very ten- 

 dinous beneath. It arises as usual from the internal condyle, and 

 is inserted into the radius from its middle to its distal end. 



The flexor carpi radialis extends from the internal condyle to the 

 proximal phalanx of the index. 



The^e,ror carpi w/nara springs from the internal condyle and the 

 olecranon, and is inserted into a large sesamoid on the outer side of 

 the base of the carpus. 



The pahnaris longus is very adherent to the muscle last described. 

 It arises from the internal condyle, and is inserted into a cartila- 

 ginous palmar disk. 



The flexor sublimis digitoruin is an exceedingly small muscle. It 

 arises from the internal condyle. Near the wrist its tendon expands 

 into a fascia which covers the palm. 



The flexor profundus digitorum and longus pollicis consist of four 

 fleshy bellies : the first of these (the deepest and largest) springs 

 from the ulna and interosseous membrane and the proximal part of 

 the radius ; one part takes origin from the distal half of the flexor 

 surface of the radius ; the third and smallest part comes from the 

 internal condyle ; while the fourth part arises from the proximal 

 part of the flexor surface of the ulna. These bellies end in a 

 common tendon, which divides and goes to the five digits. 



There are three lumbrical muscles, as in the Agouti^, 



The pronator quadratus extends over the lower (distal) half of the 

 radius and ulna. 



The extensor carpi radialis longior has a rather extensive origin 

 from above the external condyle, quite distinct from that of the 

 extensor carpi radialis brevior. It goes to the index, as usual. 



' See P. Z. S. 1866, p. 399. '' L. c. p. 403. 



