EXTREMITIES. 27 



alls externus, (P) Humero-radialis, (L). Attach- 

 ments : Posterior face of tlie humerus below the head, 

 internal border of the radius under the lateral ligament. 

 Action : Flexor of the fore-arm. 

 Posterior region, five muscles. 



1. Long extensor of the fore-arm. — Synonyms. 

 Long scapulo-olecranius, (G). Portion of the caput mag- 

 num of the triceps extensor brachii, (P). Long scap- 

 ulo-olecranius, (L). Attachments : Posterior border 

 of tho scapula, posterior border of the olecranon and 

 the antibrachial aponeurosis. Action : Extensor of 

 the fore-arm, and tensor of the antibrachial aponeu- 

 rosis. 



2. Large extensor of the fore -arm. — Synonyms. 

 Great scapulo-olecranius, (G). Portion of the caput 

 magnum of the triceps extensor brachii, (P). Attach- 

 ments : Dorsal angle and axillary border of the scapula, 

 summit of the olecranon. Action : Extensor of the 

 fore-arm. 



3. Short extensor of the fore- arm. — Synonyms. 

 Humero-olecranius externus, (G). Caput medium, (P). 

 Attachments : Curved line extending from the deltoid 

 tuberosity to the head of the humerus, and to the ole- 

 cranon. Action : Extensor of the fore-arm. 



4. Middle extensor of the fore-arm. — Synonyms. 

 Humero-olecranius internus, (G). Caput parvum, (P). 



