54 
MAMMALIAN ANATOMY 
Name of muscle 
Origin 
Insertion 
1 8. Subscapularis. 
Whole surface of the sub- 
Smaller tubercle of humerus. 
scapular fossa. 
19. Coracobrachialis. 
Coracoid process of scapula. 
Proximal end of shaft of 
humerus. 
Muscles of the outer surface of the scapula 
20. Supraspinatus, covered by 
the pectoralis minor (11). 
Whole surface of supraspin¬ 
ous fossa. 
Proximal margin of larger 
tubercle, of humerus. 
21. Infraspinatus, covered by the 
spinodeltoideus (9). 
Whole surface of infraspin- 
ous fossa. 
Larger tubercle of humerus. 
22. Teres minor. 
Ventral third of axillary 
border of scapula. 
Larger tubercle of humerus. 
Muscles of the upper arm 
23. Extensor parvus antibrachii... 
Fascia of the upper arm. 
Olecranon. 
24. Triceps brachii, of four parts 
of heads: 
(a) Long head. 
Ventral third of axillary 
border of the scapula. 
Olecranon. 
C b ) Lateral head. 
Lateral surface of the shaft 
of the humerus and lateral 
epicondyle. 
Olecranon. 
( c) Medial head. 
Medial surface of the shaft 
of the humerus. 
Olecranon. 
( d) Accessory head. 
Medial epicondyle of hu¬ 
merus. 
Olecranon. 
25. Biceps brachii. 
Anterior edge of glenoid 
cavity (tendon of origin 
runs through the inter- 
tubercular sulcus). 
Tuberosity of radius. 
26. Brachialis. .,. 
Lateral surface of proximal 
portion of humerus. 
Radius proximal to insertion 
of biceps. 
Muscles of the forearm and hand, extensor group 
27. Extensor carpi radialis. 
Lateral epicondyle of hu¬ 
merus. 
Proximal ends of second 
and third metacarpals. 
28. Extensor digitorum com¬ 
munis. 
Lateral epicondyle of hu¬ 
merus. 
Tendons pass under the 
annular ligament and are 
inserted into the middle and 
distal phalanges of the second 
to the fifth digits. 
29. Extensor pollicis et indicis.... 
Proximal region of shafts of 
ulna and radius. 
• 
Tendon enters the hand with 
that of extensor digitorum 
communis (28), divides into 
two, one of which is inserted 
into distal phalanx of pol- 
lex, the other £into distal 
end of metacarpal of index. 
30. Abductor pollicis. 
Lateral surface of shaft of 
radius. 
Metacarpal of pollex. 
31. Extensor quarti digiti, exten¬ 
sor quinti digiti, extensor 
carpi ulnaris. 
Three slender muscles arising 
close together from lateral 
epicondyle of humerus (the 
extensor quinti digiti also in 
part from the shaft of the 
ulna). 
Distal phalanx of fourth 
digit, fifth metacarpal and 
proximal phalanx of the 
fifth digit, and proximal end 
of fifth metacarpal, respec¬ 
tively. 
