412 



Arteries of the Arm. 



M. biceps brachii 



t| 



A. collatcralis uliiaris superior 



M. triceps brachii 

 (caput mediale) 



A. brachialis 



Septum intermusculare 

 mediale 



K. ulnaris 



A. collatcralis 

 ulnaris inferior 



M. brachialis 



Kpicoudylus medialis 

 humeri 



A. recurrens radialis 



Aa. rei'urrentes 

 uhuires 



M. brachioradialis 



A. interossea 

 communis 



A. mediana 



455. Arteries of the right forearm, 



viewed from in front, V^ layer. 



(The mm. pronator teres, palm;iris longus, 



flexor carpi radialis and tlexor digitonira 



subhmis have been partially removed from 



their origins on.) 



4. Ramus carpeus volaris (0. T. 



anterior radial carpal) (see Figs. 456 and 

 460), delicate, goes iilnarward at the distal 

 margin of the m. ])ronator (luadratus, di- 

 rectly upon the bone ; it helps to form the 

 rete carpi volare. 



5. Kamus carpeus dorsalis (0. T. 

 posterior radial carpal) (see Figs. 457 and 

 458), arises from the portion of the artery 

 situated in the back of the hand, extends 

 ulnarward directly upon the bones and 

 ligaments and helps to form the rele 

 carpi duvsale. 



6. A. metacarpea dorsjilis I (0. T. 

 dorsalis indicis or dorsal artery of the 

 first finger) (see Fig. 458), goes off shortly 

 before the passage of the artery through 



j^\ ^A ^^^ ' iiiterosseus dorsalis I, divides soon 



5? '^JH afterward and supplies the adjacent margins 



oj the index finger (as far as the second 

 phalanx) and thumb. A small branch to 

 the radial margin of the thumb usually 

 arises separately. 



A, ulnaris (ulnar artery) (see also 

 Figs. 453, 456 4<)(y) goes into the depth 

 at the upper margin of the m. pronator 

 teres and then turns ulnarward beneath 

 this as well as beneath the mm. flexor carpi 

 radialis and flexor digitorum sublimis, di- 

 rectly upon the m. flexor digitorum pro- 

 fundus ; it then runs along the volar margin 

 of the m. flexor carpi ulnaris, between it 

 and the mm. flexores digitorum sublimis et 

 profundus to the wrist. It is hidden in its 

 course beneath the margins of the neigh- 

 boring muscles, is accompanied ulnarward 

 for part of the way by the n. ulnaris and 

 rests upon the m. flexor digitorum pro- 

 flexor digitorum profundus fundus. In the hand it runs beneath the 



lig. carpi volare, then upon the lig. carpi 

 transversum on the radial sitle of the os 

 pisiforme and ends in the arcus volaris 

 suporficialis. Branches : 



1. Aa. recurrentes ulnares (ulnar 

 recurrent arteries) (see also Fig. 454) single 

 or in a conmion trunk from the beginning 

 of the artery; they run in a recurrent di- 

 rection, that is, proxim'alward ; one runs 

 usually u]i( m the ;niterior surface I'f the m. brachialis towards 

 the a. collatcralis ulnaris inferior, the other runs backward 

 between the origins of the mm. flexor carpi radialis and 

 flexor digitorum sublimis to the sulcus n. ulnaris of the epi- 

 coiulylus mcdialis humeri and there enters into the rete arti- 

 culare cultiti. It supj)lies the surrounding muscles and skin. 

 2. Rami musculares, in the forearm, numerous 

 branches, to the surroundinu' muscles and to the skin. 



M. pronator teres 



superticialis 

 radialis 



Earn us 

 n. 



A. radialis 



Eanius muscularis 

 a. radialis 



- N. medianus 



A. ulnaris 



Kamus muscularis 

 a. ulnaris 



N. ulnaris 



flexor pollieis longus 



INI. flexor carpi radialis 

 M. ])almaris longus 

 flexor carpi ulnaris 

 exor digit.onini sublimis 



Ramus volaris 



superticialis 



a. radialis 



Ligamentum 

 carpi volare 



