FOREARM AND HAND 



175 



of the extensor tendons, which should be attempted before the 

 superficial extensor muscles are cleaned. Introduce a blow- 

 pipe into each mucous sheath immediately proximal to the 



A. radialis " 



Sheath of flexor pollicis longus' 



Sheath of flexor carpi radialis - 

 Sheath of abductor pollicis longus -~ 

 Sheath of extensor pollicis brevis- 



M. abductor pollicis brevis - 



Brachio-radialis 



. abductor pollicis 

 longus 

 M. extensor pollicis brevis 



M. extensor pollicis longus 



^_, .Ligamentum carpi dorsale 



Mucous sheath of extensor 

 " carpi radialis longus 



- Articular capsule of wrist 



A. radialis 



Sheath of extensor carpi 



radialis brevis 



Sheath extensor pollicis longus 



Sheath of extensor digitorum 



communis 



M. interosseus dorsalis 

 primus 



- M. adductor pollicis 



FIG. 75. Dissection of the Lateral Side of the Left Wrist and Hand 

 showing Mucous Sheaths of Tendons. 



dorsal carpal ligament and then inflate the sheath. Commence 

 with the sheath of the abductor pollicis longus and the extensor 

 pollicis brevis ; then inflate in succession the sheaths of the 

 radial extensors of the wrist, the common extensor ot the fingers, 

 the extensor digiti quinti, and the extensor carpi ulnaris. A 

 better demonstration of the mucous sheaths may be made by 



