POSTERIOR MUSCLES OF FOREARM. 



211 



Insertion Dorsal surface of base of metacarpal of 

 little finger. 



Nerve Posterior interosseous. 

 EXTENSOR MINIMI DIGITI. 



Origin External epicondyle, 

 intermuscular septa. 



Insertion Divides into two ten- 

 dons on back of hand, one 

 of which communicates with 

 the common extensor ten- 

 don, passes forward, and is 

 inserted into the sides and 

 posterior surface of the first, 

 second, and third phalanges. 



Nerve Posterior interosseous. 



ANCONEUS. 



Origin External epicondyle. 

 Insertion Outer surface of ole- 



cranon and upper part of 



shaft of ulna. 

 Nerve Musculo-spiral. 



Deep Layer. 

 SUPINATOR BREVIS. 



Origin External epicondyle, 



external lateral ligament, or- 

 bicular ligament, ridge on 



outer surface of olecranon 



and upper part of ulna. 

 Insertion Fibres curve around 



the radius, and are inserted 



at the anterior and inner border of the radius, about 



its middle third. 

 Nerve Posterior interosseous, which pierces the 



muscle. 



FIG. 93. POSTKRIOR MUS- 

 CLES OF FOKEARM. 



1, biceps: 2, brarhialis snticus: 3. 

 triceps ; 4, supinator longus : 5, exten- 

 sor carpi radialis longior; 6, extensor 

 carpi radialis brevior: 7, insertion of 

 extensor radialis longior and brevior; 

 8, extensor communis digitorum : 9 ex- 

 tensor minimi digiti: 10, extensor 

 carpi ulnaris: 11, anconeus; 12, ex- 

 tensor carpi ulnaris ; 13, 14, extensors 

 of thumb ; 15, annular ligament. 



