OF THE ULXAR ARTERY. 



603 



. Descending branch from 

 superior profunda. 



Anastomotica 

 magna. 



Posterior idnar 

 recurrent. 



Posterior interosoeons. 



branches from the anterior carpal and deep palmar arch. The continuation of 

 the artery passes behind the Pronator quadratus, and, piercing the interosseous 

 membrane, gets to the back of the forearm, and anastomoses with the posterior 

 interosseousarterv (Fig. 366). It then descends to tne back of the wrist to join the 

 posterior carpal arch. The 

 anterior interosseous gives off 

 a Ion or, slender branch, the 







median artery, which accom- 

 panies the median nerve and 

 gives offsets to its substance. 

 This artery is s unetimes much 

 enlarged. It also gives off 

 nutrient branches to the radius 

 and ulna about the middle of 

 the forearm. 



The posterior interosse- 

 ous artery passes backward 

 through the interval between 

 the oblique ligament and the 

 upper border of the interos- 

 seous membrane. It appears 

 between the contiguous bor- 

 ders of the Supinator brevis 

 and the Extensor ossis meta- 

 carpi pollicis. and runs down 

 the back part of the forearm, 

 between the superficial and 

 deep layer of muscles, to 

 both of which it distributes 

 branches. At the lower part 

 of the forearm it anastomoses 

 with the termination of the 

 anterior interosseous artery. 

 Then, continuing its course 

 over the head of the ulna, it 

 joins the posterior carpal 

 branch of the ulnar artery. 

 This artery gives off. near its 

 origin, the interosseous recur- 

 rent branch. 



The interosseous recurrent 

 artery is a large vessel which 

 ascends to the interval be- 

 tween the external condyle 

 and olecranon, on or through 

 the fibres of the Supinator 

 brevis, but beneath the Anco- 

 neus. anastomosing with a 

 branch from the superior pro- 

 funda, and with the posterior 

 ulnar recurrent and anas- 

 tomotica magna. 



The muscular branches are distributed to the muscles along the ulnar side of 

 the forearm. 



The anterior carpal is a small vessel which crosses the front of the carpus 

 beneath the tendons of the Flexor profundus, and inosculates with a correspond- 

 ing branch of the radial artery. 



Posterior carpal 

 (idnar). 



Termination of an- 

 terior interosseous. 



Posterior carpal 

 (radial). 



Eadial. 



.Dorsalis pollicis. 

 rsalis indicis. 



FIG. 366. Arteries of the back of the forearm and baud. 



