136 



THE SUPERIOR EXTREMITY 



aperture near the proximal border of the transverse carpal 

 ligament, with the mucous sheath of the tendon of the flexor 

 pollicis longus. 



A. radialis 



Sheath of flexor pollicis longus r 



Sheath of flexor carpi radialis - 

 Sheath of abductor pollicis longus 

 Sheath of extensor pollicis brevis 



M. abductor pollicis brevis - 



Brach io-radial is 



M. abductor pollicis 

 longus 

 -M. extensor pollicis brevis 



M. extensor pollicis longus 



carpi dorsale 



Mucous sheath of extensor 

 carpi radialis longus . 



Articular capsule of wrist 



A. radialis 



Sheath of extensor carpi 



radialis brevis 



Sheath extensorpollicislongus 



Sheath of extensor digitorum 



communis 



M. interosseus dorsalis 

 primus 



-M.' adductor pollicis 



FIG. 59. Dissection of the Lateral Side of the Left Wrist and Hand 

 showing Mucous Sheaths of Tendons. 



The Constitution of Mucous Sheaths of Tendons. The 



student should understand the nature of mucous sheaths 

 which surround tendons, where they pass through fascial or 

 osteo-fascial canals. The majority of the mucous sheaths 



