THE MUSCLES II9 



Fig. 55. 



Fig. 55. — Lateral or Outer Aspect of Muscles of the Pectoral Limb. 

 a. Cranial part of the ento-triceps; a7i, annular ligament; aw, abductor digiti 

 quinti; c, extensor carpi radialis brevis; del, acromiodeltoid; dl, biceps; ecd, ex- 

 tensor communis digitorum; ecrl, extensor carpi radialis longus, whose tendon is 

 marked w; emd, extensor digitorum lateralis; ei, extensor indicis; exul, extensor 

 carpi ulnaris; eom, extensor brevis pollicis; ex, ulnar head of the flexor carpi 

 ulnaris; fu, flexor profundus digitorum; hu, humerus; i, caudal part of the ento- 

 triceps; o, olecranon process of the ulna; ^, claw of first digit; ^ec^, portion of 

 the pectoralis; r, region of the head of the radius; 5/), spine of the scapula; sh, 

 supinator longus; tri, ecto-triceps (caput laterale of triceps brachii) with its mid- 

 dle portion cut out. 



