THE POSTERIOR RADIOULNAR REGION 



213 



minimi digiti tendon are always on the ulnar side of the respec- 

 tive common extensor tendons. 



Fia. 35 



ANTERIOR 



ANNULAR 



LIGAMENT, 



FLEXOR LONGUS POLLICIS. 

 FLEXOR CARPI RADIALIS. 

 MUSCLES OF THUMB 



Mrtac.arpal. 



^Median nerve. 

 Ulnar vessels. 



ALMARIS BREVIS. 



MUSCLES OF 

 LITTLE 

 FINGER. 



EXTENSOR 



BREVIS 



POLLICIS. 



EXTENSOR 



LONGUS 



POLLICIS. 



Trapezium. 



Rad'xtl vessels. 



EXT. CARP. RAD. LONG. 



Trapezcid. 



EXTENSOR CARPI RADIALIS 

 BREVIOR. 



EXT. CARPI 

 ULNARIS. 



EXTENSOR 



INIMI 

 DIGITI. 

 EXTENSOR 

 COMMUNIS 

 DIGITORUM 



EXTENSOR INDICIS. 



Os magnum. 



Transverse section through the carpus, showing the relative positions of the 

 tendons, vessels, and nerves. (Henle.) 



5. M. Extensor Brevis Pollicis (extensor primi internodii 

 pollicis). Origin, small part of the interosseous membrane 

 and radius below the middle, next below the extensor ossis; 

 insertion, proximal end of the proximal phalanx of the thumb 

 on its dorsal aspect. 



Nerves. For the radial and posterior groups wholly by the 

 musculospiral; the anconeus, supinator longus, and extensor 

 carpi radialis longior by that nerve before it divides; all the 

 others by its posterior interosseous branch. 



Three nerves, therefore, supply all the muscles of the fore- 

 arm median and ulnar anteriorly (flexor carpi ulnaris and 

 inner half of the flexor profundus by the ulnar), musculospiral 

 externally and posteriorly. 



