7 2 OUTLINES OF ANATOMY. 



Branches of the deep palmar arch, 576-7-8-9 ; Figs. 355 and 359. (567-8) 

 Princeps pollicis. Radialis indicis. 

 Palmar interosseous arteries. 

 Recurrent branches. 



Posterior communicating or perforating. 

 Back of the forearm and hand. 



To remove the skin from the back of the hand, make a median incision from the wrist to the interval 

 between the second and third fingers. Make a transverse incision at the base of the fingers, and median 

 dorsal incisions to the end of each finger and the thumb. Turn the skin each way from the median 

 incisions and remove. 



Cutaneous nerves, Fig. 459 ; P. 842. (822) 



Dorsal, or posterior branch of the ulnar nerve, 840. (821) 

 Radial nerve, 841-2. (823) 



The dorsal surface of the thumb, and of the first second, and third fingers, re- 

 ceive branches from the terminal divisions of the median, 839. (819) 

 Nerve supply of the dorsal integument of the hand, 842-3. (823) 

 Dorsal venous plexus, 679. (665) 



Digital veins. 

 Deep fascia, posterior annular ligament, 327-8. (329) 



Dorsal fascia, 351. 



Reflect the deep fascia from the posterior surface of the forearm and hand. Preserve the posterior an- 

 nular ligament. 



Brachio-radialis, or supinator radii longus, 339; Figs. 272 and 276. (340) 



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

 Extensor carpi radialis longior, 341 ; Figs. 276 and 275. (340-1-2) 



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

 Extensor carpi radialis brevior, 341-2; Fig. 276. (342) 



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

 Extensor communis digitorum, 342-3-4 ; Figs. 276-7. (343-4-5) 



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

 Extensor minimi digiti, 344-5 ; Figs. 276-7. ' (345) 



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

 Extensor carpi ulnaris, 345 ; Fig. 276. (345-6) 



Origin, first head, second head. Insertion. Structure. 



Nerve-supply. Action. Relations. Variations. 

 Anconeus, 345-6 ; Figs. 276-8. (346) 



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



To expose the deeper layer of muscles detach the externus carpi ulnaris, externus minimi digiti, exter- 

 nus communicans digitorum, and externus carpus radicis brevior at their origin and throw forward. 

 Note the vessels and nerves entering their deep surface. 



Extensor ossis metacarpi pollicis, 348 ; Fig. 278. (348-9) 



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

 Extensor brevis pollicis, 349; Fig. 278. 



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

 Extensor longus pollicis, 349-50 ; Fig. 278. (350) 



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

 Extensor indicis, 350-1 ; Fig. 278. 



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



Divide the anconeus at its origin and reflect to the insertion. 

 Expose the supinator brevis. 



Supinator radii brevis, 346-7-8; Fig. 278. (346-7-8) 



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

 Posterior interosseous artery, 566-7 ; Fig. 353. (557) 



Interosseous recurrent, or posterior interosseous recurrent. 



Muscular branches. Articular branches. 

 Posterior terminal branch of anterior interosseous artery, 566. (557) 



Posterior carpal rete. 

 Posterior interosseous nerve, 841. (823) 



