THE UPPER EXTREMITY. 71 



Branches of the Superficial Palmar Arch : 



Muscular branches. 



Cutaneous branches. 



Deep branch. 



Median nerve, 838-9 ; Fig. 458. (817-18-19) 

 Branch to the muscles of the thumb. 

 External terminal division, outer branch, inner branch. 

 Internal terminal division, outer branch, inner branch. 

 Pacinian corpuscles. 



Ulnar nerve, 840; Fig. 458. (820-1) 



Superficial terminal branch : 



Inner branch. Outer branch. 

 Anterior annular ligament, 1204-5. (1180-1) 



Synovial membranes, synovial sacs, 1207-8-9. (1182-3-4) 

 Ligamenta vaginialia, 352 ; Figs. 279-80. 

 Sheaths of the flexor tendons, or thecae, 352. 



Vincula accessoria, ligamenta brevia, ligamenta longa. 



Theca of thumb. Theca of little finger. 



Divide the anterior annular ligament and expose the structures passing underneath. Open the sheaths 

 of the tendons and trace each tendon to its terminal insertion. 



Flexor sublimis digitorum, 332-3-4-5 ; Fig. 280. (334-5-6) 



Insertion. Structure. Action. Relations. Variations. 

 Flexor longus pollicis, 337-8. (338-9) 



Insertion. Structure. Action. Relations. Variations. 



Cut the ulnar artery just below the deep or communicating branch and throw forward the superficial 

 palmar arch. Divide the flexor sublimis digitorum and the median nerve at the middle of the forearm 

 and throw forward, exposing the flexor profundus digitorum and the lumbricales. 



Flexor profundus digitorum, 335-6-7 ; Figs. 279-80-3. (336-7-8) 



Insertion. Structure. Action. Relations. Variations. 

 Lumbricales, 354-5-6; Figs. 283 and 279. (354-5) 



Origin. Insertion. Structure. Nerve-supply. Action. Relations. Variations. 

 Muscles of the thenar eminence, 358. 



Abductor pollicis, 358-9-60 ; Fig. 280. (358-9) 



Origin. Insertion. Structure. Nerve-supply. Action. Relations. Variations. 



Divide the abductor pollicis near its origin and turn it forward to the insertion. 

 Opponens pollicis, 360 ; Fig. 283. 



Origin. Insertion. Structure. Nerve-supply. Action. Relations. 

 Flexor brevis pollicis, 360-1-2 ; Figs. 283-4. (360-1) 



Origin, outer head, inner head. Insertion. Structure. 



Nerve supply, outer head, inner head. Action. Relations. 

 Adductor pollicis, or adductor pollicis transversus, 362 ; Fig. 284. (361-2) 



Origin. Insertion. Structure. Nerve-supply. Action. Relations. Variations. 

 Muscles of the hypothenar eminence, 363. (362) 

 Abductor minimi digiti, 363 ; Fig. 283. (362) 



Origin. Insertion. Structure. Nerve-supply. Action. Relations. 



Divide the abductor minimi digiti near its origin and turn forward to the insertion. 



Flexor brevis minimi digiti, 363; Fig. 283. 



Origin. Insertion. Structure. Nerve-supply. Action. Relations. Variations. 



Divide the flexor brevis minimi digiti at its origin and throw forward to the insertion. 



Opponens minimi digiti, 364; Fig. 284. (363). 



Origin. Insertion. Structure. Nerve-supply. Action. Relations. Variations. 

 Deep branch of the ulnar nerve, 840. (821) 

 Radial artery in the palm, 576. (565-67) 



Variations in the deep palmar arch. 



