MUSCLES OF THE THORACIC LIMBS. 167 
larly named heads in man; the medial portion falls into a 
number of subdivisions whose homologues are uncertain. 
Fic. 79.—DEEP MUSCLES ON THE MEDIAL SIDE OF THE HUMERUS. 
a, M. supraspinatus; 4, M. subscapularis; ¢, M. coracobrachialis; ¢d, M. teres 
major (@’, its tendon); ¢, part of M. latissimus dorsi joining the teres major; /, cut 
end of M. pectoralis minor; g, long part of caput mediale of M: triceps brachii; 4, in- 
termediate part of caput mediale of M. triceps; z, M. brachialis (z’, its tendon); 7, short 
part of caput mediale of M. triceps; 4, cut end of M. clavobrachialis; 4 2’, cut ends 
of M. biceps; #, M. brachioradialis; 7, M. extensor carpi radialis longus; 0, M. ex- 
tensor carpi radialis brevis; /, fifth head of M. flexor profundus digitorum; 4, first 
head of M. flexor profundus digitorum, 1, humerus; 2, olecranon; 3, medial epi- 
condyle of humerus. 
Caput laterale (anconeus lateralis) (Fig. 75, 2; Fig. 68, 7). 
—The lateral portion is a flat muscle (most of it subcutaneous) 
on the lateral side of the brachium, connecting the proximal 
end of the humerus with the olecranon process of the ulna. 
