32 



PLATE XVI. 



MUSCLES 



A Triceps. 



B Biceps. 



C Brachialis anticus. 



D Anconeus. 



E Supinator longus. 



F Extensor carpi radialis longior. 



G Extensor carpi radialis brevior. 



H Supinator brevis. 



I 



K 

 L 

 M Extensor indicis. 



Extensor ossis metacarpi pollicis. 

 Extensor primi internodii pollicis. 

 Extensor secundi internodii pollicis. 



N Extensor medius. 



Cut origins of the extensor minimi 

 digiti and communis digitorum. 



P Cut origin of extensor carpi ulnaris. 



P' Tendon of extensor carpi iilnaris (in- 

 sertion). 



R Insertion of pronator radii teres. 



S Dorsal interossei. 



T Adductor pollicis. 



V Abductor minimi digiti. 



X Posterior ligament of wrist. 



Y Flexor ossis metacarpi minimi digiti. 



VESSELS 



a Posterior interosseous artery. 



b Recurrent branch of posterior inter- 

 osseous, ascending under cover of 

 anconeus. 



c Posterior terminal branch of superior 

 profunda. 



d Radial artery. 



e Posterior carpal of radial. 



/ Metacarpal of radial coming off, as it 

 often does, in common with the 

 posterior carpal. 



g Posterior carpal of ulnar. 



h Dorsalis indicis. 



i Metacarpal arteries from posterior 

 carpal arch. 



k Posterior branches of anterior inter- 

 osseous artery. 

 I Radial recurrent. 



NERVES 



1 Posterior interosseous. 



2 Its muscular branches to the extensores 



carpi ulnaris, communis digitorum, 

 and minimi digiti. 



3 Terminal branch, with slight enlarge- 



ment (pseudo-ganglion) on it at wrist. 



4 Its branch to extensor ossis metacarpi 



pollicis. 



5 Its branch to extensor primi internodii 



pollicis. 



6 Its branch to extensor secundi inter- 



nodii pollicis. 



7 Its branch to the extensores indicis 



and medius. 



8 Musculo-spinil. 



9 Its branch to supinator longus. 



10 Its branch to extensor carpi radialis 



longior. 1 



11 Its branch to brachialis anticus. 



12 Branch to extensor carpi radialia 



brevior. 2 



13 Radial nerve. 



14 Branch of posterior interosseous to 



supinator brevis. 



1 The branch from the musculo-spiral to (F) the extensor carpi radialis longior in the small sketch 

 has been numbered 9 instead of 10. 



- The branch to the extensor carpi radialis brevior usually comes off from the posterior inter- 

 osseous, but here it came off from the musculo-spiral, and ran down loosely attached to the radial nerve 

 from which it appears in the plate to take its origin. 



