204 



ATLAS AND TEXT-BOOK OF HUMAN ANATOMY. 



four tendons of the extensor digitorum communis and that of the extensor indicis proprius. The 

 fifth compartment contains the slender tendon of the extensor digiti V proprius and is superficially 

 situated. The sixth and last compartment gives passage to the tendon of the extensor carpi 

 ulnaris. 



The synovial sheaths are considerably longer than the width of the dorsal carpal ligament ; 

 those of the extensores communis, indicis, and digiti V may extend to the middle of the meta- 

 carpus. 



Tendons of extensor digitorum 



Junctures tendinum *£■--• 



Tendon-sheath of extensor ,-' 

 digiti V proprius 



Tendon-sheath of extensor-" 

 carpi ulnaris 



Common tendon-sheath of ex- '* 

 tensor digitorum and exten- 

 sor' indicis 



Tendo)i-sJicath of extensor pollicis longus 



Inlcrosseus dorsalis I 



Tendon-sheath of extensor pollicis 

 brci'is 



\ Tendon-sheath of abductor pollicis 

 longus 



I Tendon-sheath of extensor carpi radialis longus 

 Tendon-sheath of extensor carpi radialis brcvis 



Fig. 2S9. — The arrangement of the tendons of the extensor muscles and their tendon-sheaths beneath the dorsal carpal 



ligament and in the hand (somewhat diagrammatic). 



THE EXTENSOR TENDONS OF THE FINGERS. 



The extensor tendons or dorsal aponeuroses of the fingers (Figs. 281, 286, and 289) are chiefly 

 composed of the tendons of the extensores digitorum, but also receive fibers from the tendons 

 of the interossei and lumbricales. 



