Arteries of the Arm. 



413 



456. Arteries of the right forearm. 



viewed from in front, 2"^ layer. 



(The mm. brachioradialis, pronator teres, 



flexor carpi radialis and flexores digi- 



torum sublirais et profundus have been 



removed.) 



3. Ramus carpeus volaris (O.T. 

 anterior uhiar carpal) (see also Fig. 4tiO), 

 usuall}' double, delicate, goes radial- 

 ward in the neighborhood of the wrist, 

 directly upon the bone, to the rete 

 carpi volare. 



4. Ramus carpeus (lorsalis(O.T. 

 posterior ulnar carpal) (see Figs. 457, 

 458 and 460) runs, directly upon tbe 

 bone, around the ulna to the back of 

 the hand and to the rete carpi dorsale. 



5. Ramus volaris profuudus 

 (0. T. deep ulnar artery) (see Figs. 459 

 and 460) arises close to the os ])isi- 

 fomie, goes into the depth between the 

 origins of the mm. flexor digiti V brevis 

 and abductor digiti V and helps to 

 form the areas volaris profundus ; it 

 gives ofi' small branches to the muscles 

 of the ball of the little finger. From 

 this liranch, or from the stem of the 

 a. ulnaris itself, an artery passes beneath 

 the m. palmaris brevis upon the muscles 

 of the ball of the little finger (giving 

 branches to these and to the skin) to 

 the ulnar margin of the 5th finger. 



6. A. interossea communis (com- 

 mon interosseous artery) (see also 

 Fig. 455) goes off a little below thi' 

 tuberositas radii and divides imme- 

 diately into two branches: 



a) A. interossea volaris (0. T. ante- 

 rior interosseous artery) runs distal- 

 ward directly upon the volar sur- 

 face of the membrana interossea, 

 covered by the m. flexor digitorum 

 profundus ; it supplies the nniscles 

 of the volar surl'ace and sends a 

 series of branches through the mem- 

 brane to the muscles of the posterior 

 surface; it also sends branches to 

 the radius and ulna. It reaches the 

 dorsal surface of the membrana 

 interossea at the upper margin of 

 the m. pronator quadratus and runs 

 distal ward upon it to the rete carpi 

 dorsale (see Figs. 457 and 458); a 

 small branch remains upon the volar 

 surface and goes to the rete carpi 

 volare (see also Fig. 460). Branch : 

 aa) A. mediana (0. T. median artery 

 or arteria comes nervi mediani) 

 (see Fig. 455), comes off from the 

 first portion of the artery, is slender 

 and accompanies the n. medianus 

 distalward, finally to reach the palm. 



Spalteholz, Atlas. 



M. biceps brachii 



M. tricep.s brachii 

 (caput mediale) 



A. brachialis 



A. coUatefalis 

 ulnaris superior 



A. collateralis 

 ulnaris inferior 



M. brachialis 



A. recurreus 

 radialis 



Aa. recurrentes 

 ulnares 



A. interossea 

 communis 



M. extensor carj)! 

 radialis longus 



>I. flexor pollicis longus 

 - A. radialis 

 A. ulnaris 



Eamus muscularis 

 A. interossea volaris 

 Membrana interossea 

 . - Ulna 



M. flexor carpi ulnaris 



Ramus muscularis 



31. pronator quadratus 



Ramus carpeus volaris 

 J -- Ramus carpeus volaris 



_ Ramus volaris superficialis 

 Rete carpi volare 



27 



