THE SUPERIOR EXTREMITY 



It is broad and shallow, and it holds the tendons of the 

 extensor carpi radialis longus and extensor carpi radialis brevis 



Flexor digitorum sublimis 



Median nerve M Flexor digitorum profundus 

 Palmaris longus 

 Flexor carpi radiali 



Cavity of synovial sheath 

 Flexor carpi ulnaris 



Flexor pollicis longus 

 Radial artery 



Pronator quadratus 



Abductor pollicis 

 longus 



Ligamentum carpi 

 dorsale 



Extensor pollicis 

 brevis 



Ulnar artery 



/Ulnar nerve 



Dorsal branch 'of 

 ulnar artery 

 Basilic vein 



Ant. ligament of 



distal radio-ulnar 



joint 



Ulna 



Styloid process 

 of ulna 



Extensor carpi ulnaris 

 ' Extensor digiti quinti proprius 

 Extensor digitorum communis 



Cephalic veir 

 Extensor carpi radialis longus 



Extensor carpi radialis brevis ! 



Extensor pollicis longus Extensor indicis proprius 



FIG. 8 1. Transverse section through Forearm proximal to the Ligamentum 

 Carpi Transversum. Showing the relation of the mucous sheaths to the 

 tendons. 



and their mucous sheaths. The third compartment is formed 

 over the narrow, deep, oblique intermediate groove on the 

 dorsum of the distal end of the radius. It contains the tendon 



FIG. 82. (From Luschka.) 



1. Middle metacarpal bone. 



2. Tendon of flexor digitorum subliinis. 



3. Tendon of flexor digitorum profundus. 



4. Second lumbrical muscle. 



5. Second dorsal interosseous muscle. 



6. Common extensor tendon. 



I., II., and III. The three phalanges. 



of the extensor -pollicis longus and its mucous sheath. The 

 fourth compartment is placed over the wide shallow groove 

 which marks the medial part of the dorsal aspect of the distal 



