460 MR. ST. GEORGE MIVART ON THE [June 24, 
It arises from the occiput, and is inserted into the inner side of the 
dorsum of the scapula, being conterminous with the insertion of the 
serratus magnus. 
The omo-hyoid has been already described amongst the muscles of 
the head. 
Subclavius (fig. 3, S). This is an elongated muscle, like the 
precoracoidal cartilage to which it is attached. It arises from the 
ventral surface of the last-named cartilage, and is inserted into the 
upper part of the crest of the humerus, immediately opposite the 
summit of the biceps and between the insertions of the pectoralis, 
deltoid, and trapezius. 
Deeper flexor muscles of right forearm, the flexor longus being cut and reflected 
B. Biceps. C. B.2. Coraco-brachialis. F. B. Flexor brevis. FL. Flexor 
longus. P.7.1& P. 7.2. Pronator teres. S.Z. Supinator longus. 72. 
Triceps. 
Coraco-brachialis (figs. 4. & 6, C. B). This muscle consists of 
two parts. 
1. The first part arises from the whole ventral surface of the 
coracoid, partly covered externally by the pectoralis, and partly 
appearing superficially between the second part of the pectoralis and 
omo-hyoid. It also arises from the postero-external margin of the 
coracoid. It is inserted into the humerus, between the implantation 
of the pectoralis and the origin of the biceps on the one hand, and 
the upper portion of the second part of the coraco-brachialis on the 
other. 
2. The second portion of the muscle is thick and long. It arises 
from the posterior margin of the coracoid close behind the glenoid 
cavity ; passing down, it is inserted into the shaft of the humerus to 
and at the internal condyle. 
The deltoid (fig. 3, D) is a larger muscle than the trapezius. It 
arises from the outside of the scapula, and is inserted into the crest 
of the humerus immediately outside and behind the insertion of the 
subclavius. 
Subscapularis. A very few and short muscular fibres, passing 
from just inside the postero-inferior margin of the scapula (close to 
the glenoid surface) to the adjacent part of the humerus, appear to 
represent this muscle. ‘These are, however, difficult to distinguish 
trom the adjacent coracoidal part of the triceps. 
Biceps (figs. 3, 4, & 6, B). This muscle, which is quite single, 
springs from the tuberosity of the humerus just below the in- 
