350 



PRACTICAL ANATOMY. 



connective tissue between the muscle and the ones on each side of it. Be careful, 

 in doing this, not to destroy the vessels and nerves ; these structures will become 

 numerous in the region of the elbow. Trace these adjacent muscles also up to 



their origin. 



Extensor ossia metacarpi 

 pollicis 



Extensor brevis pollicis 



Posterior annular ligament 



Extensor carpi 

 radialis brevior 



Extensor carpi 



Extensor lo 

 pollici; 



pollic 



Extensor carpi ulnana 



Extensor communia digitorum 



Extensor minimi digui 



Extensor indicia 



Attachment of extensor 

 com m uniti digitorum 

 to second phalanx 



Attachment of extensor 

 communia digitorum 

 to third phalanx 



FIG. 244. TENDONS UPON THE DORSUM OF THE HAND. 



Trace the superficial group to origin as follows (Fig. 243) : 



1. Extensor communis digitorum to the outer condyle of the humerus. 



2. Extensor minimi digiti to the outer condyle of the humerus. 



3. Extensor carpi ulnaris to the outer condyle of the humerus. 



Notice the triple origin of the extensor carpi ulnaris : (i) The outer con- 



