THE ULNAR NERVE 



989 



In the upper forearm the ulnar nerve Hes on the flexor digitorum profundus, covered by the 

 flexor carpi ulnaris. Near the junction of the upper and middle thirds of the forearm it is joined 

 by the uhiar artery, which accompanies it to its termination, lying throughout on its radial side 

 (fig. 759). In the lower part of the forearm it still rests on the flexor digitorum profundus, but 



Fig. 759. — Deep Nerves of the Volar Surface of the Forearm^ (After Toldt, "Atlas 

 of Human Anatomy," Rebman, London and New York.) 



Biceps brachu " i 



^\ 

 Brachiahs"- m. ^ 



Radial (musculo-spiral) nerve , i Vk 



^ Medial intermuscular septum 



,,-Brachial artery 



Superficial radial " ' 

 Muscular branches •■ 



Supinator 



^i \ \[ ^^ ,. Median nerve (drawn 



,'» gi?' V // ' **^ \«// medialwardj 



I sif ifi' M^\ ^" 



Extensores carpi 

 radiales 



brevis " [ "* 



W* / Si; 



[ longus . » ^ 



iiunv„#H^ 



Brachio-radialis - ; 



Pronator teres --- 



• Muscular branches 



Common head for the super- 

 ficial palmar muscles 



Radial artery 



Radial head of flexor digitorum 

 sublimis 



Lateral antibrachial cutaneous nerve 

 Flexor poUicis longus 



Ulnar artery 

 '.m& J Ulnar nerve 



Superficial radial --- 



III iv 



Palmar branch of median f/ wCf 4k 



Twig to wnst-joint ' 



Tendon of flexor carpi radialis .-■'/" M^ ,-■■■''{ 

 Twig to wrist-joint ' 



Transverse carpal ligament ,- 



■ Ulnar artery 



Muscular branch 

 Flexor carpi ulnaris 



Volar antibrachial interosseous 

 nerve 



Humeral head of flexor digitorum 

 sublimis 



Palmar cutaneous branch (cut short) 



Deep branch of ulnar 

 Abductor digiti quinti 



^~--., Flexor digiti quinti brevis 

 ■*•» Palmaris brevis 



between the flexor carpi ulnaris and flexor digitorum sublimis, and is covered only by skin and 

 fascia. At a variable point in this part of the forearm, usually about 5 to 8 cm. (2 to 3 in.) 

 from the carpus, the nerve divides into its two terminal branches, a dorsal branch to the dorsal 

 aspect of the hand, and a volar branch to the volar aspect. 



