36 MUSCLES OF THE SHOULDER AND ARM. 
ce. The most external of the three divisions arises 
from the head of the humerus Just beneath the inser- 
tion of the teres minor, and from fascia along the outer 
part of the humerus. 
d. The middle division arises, in common with the 
last, just beyond the head of the humerus. 
The divisions 6,c and dare inserted into the ole- 
cranon process along with a. 
Cut through the bellies of the triceps, and reflect the 
cut ends. 
19. The Brachialis Anticus is a flat muscle closely 
adherent to the humerus; it arises from the dorsal 
and external aspect of the humerus throughout most 
ep its extent.” The fibres pass ‘over to the santenor or 
ventral face of the humerus, and at the elbow end in a 
tendon which is inserted into the ulna. The tendon 
passes between the two terminal tendons of the 
biceps, fusing with them. 
20. The Sub-anconeus is a very small muscle 
which arises from the dorsal surface of the distal 
end of the humerus round the margins of the ole- 
cranon fossa. The muscle adheres closely to the hu- 
merus, and is inserted into the olecranon process and 
outer side of the ulna. 
