ULNAR 



537 



Relations. — In front : in addition to the skin and superficial fascia, the vessel 

 is crossed successively, from witliin outwards, by the palmaris breyis, the palmar 

 branch of the ulnar nerye, the i)a]mar fascia, and the palmar branch of the median 

 nerve. 



Behind, it rests u))on, from within outwards, the short muscles of the little 

 finger, the digital branches of the ulnar nerve, the flexor tendons, and the digital 

 branches of the median nerve. 



Fig. 0.55.— The Akteriks of the Kight Fore.\rm and the Deep Palmar Arch. 



Inferior profunda artery 

 Aiiastoiiiolico magna artery 



Brachial artery 

 Radial recurrent artery . 



Supinator longus 



Radial artery. 



Flexor longus pollicis muBcle 



b 



■Braehialis autieus muscle 

 Anterior ulnar recurrent 

 I'otiterior ulnar recurrent 



-l-'lnar artery 



.\ liter lor interosseous artery 

 Flexor carpi ulnaris 



Flexor profundus digitorum muscle 

 . Anterior interosseous artery 



Anterior annular ligament, cut - 



Anterior branch of ulnar artery, cut 

 Deep palmar arch 



Collateral branch of palmar digital artery 



^ps 



^.-^. 



w 



w 



Palmar iiiterosseotis arteries 

 Palmar digital artery, cut short 



Variatioii.i in the Superjicial Palmar Anli 



The superficial palmar arch is very .subject tn variations. (A) It may be formed by the 

 superficial branch of the ulnar ana.«;toni()siiiir witli the radialis indicis. or witli the radial in the 

 palm instead of with the supei-ficial volar branch of the radial. (B) The superficial volar may be 

 larger than usual, and take a s^reater share than the ulnar in the formaticm of the arch. (C) The, 

 arch may be reinforced by a large median artery, or by an enlarged intero.sseous artery. (D) The 

 arch may be double, both the superficial branch of the ulnar and the superficial volar dividing 



