ULNAR ARTERY BRANCHES. 307 



and in the palm it rests upon the tendons of the flexor sublimis, being 

 covered in by the palmaris brevis muscle and palmar fascia. It is accom- 

 panied in its course by the venae comites, and is in relation with the ulnar 

 nerve for the lower two-thirds of its extent. 



Plan of the Relations of the Ulnar Artery. 



In Front. 



Deep fascia, 



Superficial layer of muscles, 

 Median nerve. 



In the Hand. 



Tendinous arch from the pisiform bone, 



Ealmaris brevis muscle, 



Palmar fascia. 



Behind. 



Brachialis anticus, 



Flexor profundus digitorum, 



Pronator quadratus. 



In the Hand. 



Annular ligament, 

 Tendons of the flexor sublimis digitorum. 



The Branches of the ulnar artery may be arranged, like those of the 

 radial, into three groups : 



' Anterior ulnar recurrent, 

 Posterior ulnar recurrent, 



( Anterior interosseous, 

 Interosseous, 



Fore-arm, 



^ Muscular. 



w . . ( Carpalis anterior, 

 I Carpalis posterior. 

 Handy Digitales. 



The Anterior ulnar recurrent arises immediately below the elbow, and 

 ascends in front of the joint between the pronator radii teres and brachialis 

 anticus, where it inosculates with the anastomotica magna and inferior 

 profunda. The two recurrent arteries frequently arise by a common 

 trunk. 



The Posterior ulnar recurrent, larger than the preceding, arises imme- 

 diately below the elbow joint, and passes backwards beneath the origins 

 of the superficial layer of muscles ; it then ascends between the two heads 

 of the flexor carpi ulnaris, and beneath the ulnar nerve, and inosculates 

 with the inferior profunda and anastomotica magna. 



The Common interosseous artery is a short trunk which arises from the 

 nlnar, opposite the bicipital tuberosity of the radius. It divides into two 

 branches, the anterior and posterior interosseous arteries. 



