DISSECTING MANUAL. 



largement giving articular branches to the carpal joints. Mus- 

 cular branches supply the Extensor carpi radialis brevior, Su- 

 pinator brevis, Extensor communis digitorum, Extensor minimi 

 digiti, Extensor carpi ulnaris, Extensor ossis metacarpi pollicis, 

 Extensor longus pollicis, Extensor brevis pollicis, and Exten- 

 sor indicis. [634] 



ARTERIES. 



The brachial divides in front of the elbow into the radial 

 and ulnar. [830] 



Radial. The first part descends under the Supinator longus 

 and then runs superficially to the styloid process of the radius ; 

 thence the second part curves, under the tendons, around the 

 outer side of the carpus and across the trapezium to the upper 

 end of the first interosseous space; and thence the third part 

 runs forward between the heads of the first Dorsal interosseous 

 and then inward to join the deep branch of the ulnar and 

 complete the deep palmar arch. [831] 



Branches. First part : radial recurrent, to front of external 

 condyle; muscular; superficialis volse, to front of ball of thumb, 

 often completing the superficial palmar arch; anterior radial 

 carpal, to front of carpus. Second part : dorsales pollicis, two 

 branches to sides of thumb on dorsal aspect; dorsalis indicis, 

 to radial border of dorsum of index finger; metacarpal (first 

 dorsal interosseous) to second interdigital cleft, dividing to 

 supply adjacent sides of second and third fingers; and pos- 

 terior radial carpal, to back of carpus. Third part: princeps 

 pollicis, to thumb, dividing to supply both sides of its dorsum; 

 radialis indicis, to radial side of index finger. [832] 



Ulnar. Running downward and inward under the super- 

 ficial muscles to the junction of the upper and middle thirds 

 of the forearm, it then descends vertically, crosses the annular 

 ligament external to the pisiform bone and enters the palm 

 to form the superficial palmar arch. [834] 



Branches : anterior ulnar recurrent, to front of internal con- 



[178] 



