212 



Arteria radialis et ulnaris. 



,M.pron,quadr. 



M. 



abduct. poll 

 brev. ^; 



A.dig 



vol.comm. 



I. 



AA.digit. 

 vol. propr. 



558. The Deep Palmar Arcli. 



Further brandies of the ulnar artery (see Fig. 555 and 556) are: 



4. The common inter osseous artery, Art. interossea antibrachli 

 communis, which, soon after its origin, divides into the posterior or 

 external and anterior or internal branch. The posterior 

 inter osseous artery passes through the interosseous membrane, sends 

 the interosseous recurrent branch to the posterior region of the 

 elbow, lies upon the MM. extensor ossis metacarpi and extensor secundi 

 intcrnodu polUcis, gives off a number of muscular branches and finally 

 anastomoses with the posterior carpal branch of the radial artery so 

 as to form the posterior carpal arch, Bete carpi dorsale. The 

 anterior interosseous artery passes down the forearm on the 

 anterior surface of the interosseous membrane to the M. pronator qua- 

 dratic, behind which it passes, gives off a branch to the Rete carpi volare, 

 and, piercing the interosseous membrane as Art. perforans inferior, descends 

 to the back of the wrist, where it joins the posterior carpal arch. 



5. The last branch of the ulnar artery before it divides, is the 

 posterior carpal, for the posterior carpal arch. 



