282 PROF. ST.-GEORGE MIVART ON THE [Feb. 21, 
The subscapularis is a strong muscle arising from the cartilage of 
the first rib, and inserted into the outer part of the clavicle. 
The deltoid has a distinct clavicular portion, as well as that from 
the metacromion and fascia investing the infraspinatus. 
The supraspinatus, infraspinaius, teres major, teres minor, and 
subscapularis are as in the Agouti’. 
The diceps has the usual two heads and radial insertion. 
The coracobrachialis consists of two parts—one descending to the 
middle of the humerus, the other down to the internal condyle. 
The brachialis anticus takes origin from the back of the summit 
of the shaft of the humerus, from the whole of its outer side, and 
from its lower front part. It is inserted into the radial side of the 
ulna by a strong tendon. 
The ¢riceps has the usual three heads and the normal insertion. 
The supinator longus is very distinct, arising by delicate fascia 
from the external condyloid ridge between the summit of the origin 
of the extensor carpi radialis longior and the brachialis anticus. It 
is inserted into the outer side of the styloid process of the radius. 
The supinator brevis arises from the annular ligament and shaft 
of the radius as usual, and extends about halfway down the radius. 
The pronator radii teres is a very strong muscle, and very ten- 
dinous beneath. It arises as usual from the internal condyle, and 
is inserted into the radius from its middle to its distal end. 
The flewor carpi radialis extends from the internal condyle to the 
proximal phalanx of the index. 
The flexor carpi ulnaris springs from the internal condyle and the 
olecranon, and is inserted into a large sesamoid on the outer side of 
the base of the carpus. 
The palmaris longus is very adherent to the muscle last described. 
It arises from the internal condyle, and is inserted into a cartila- 
ginous palmar disk. 
The flezor sublimis digitorum is an exceedingly small muscle. It 
arises from the internal condyle. Near the wrist its tendon expands 
into a fascia which covers the palm. 
The flexor profundus digitorum and longus pollicis consist of four 
fleshy bellies: the first of these (the deepest and largest) springs 
from the ulna and interosseous membrane and the proximal part of 
the radius; one part takes origin from the distal half of the flexor 
surface of the radius; the third and smallest part comes from the 
internal condyle; while the fourth part arises from the proximal 
part of the flexor surface of the ulna. These bellies end in a 
common tendon, which divides and goes to the five digits. 
There are three /umérical muscles, as in the Agouti’. 
The pronator quadratus extends over the lower (distal) half of the 
radius and ulna. 
The extensor carpi radialis longior has a rather extensive origin 
from above the external condyle, quite distinct from that of the 
extensor carpi radialis brevior. It goes to the index, as usual. 
1 See P. Z, 8. 1866, p. 399. > Lic. p. 403. 
