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tiie upper part of the radius. Its fleshy and thick belly di*
vides about the middle of the fore arm into four fleshy slips,
each of which gives off a slender tendon, which passes under
the annular ligament, to be inserted, after being perforated
near the first phalanx of the fingers, by the tendons of the
flexor digitorum profundus, into the fore part of the second
phalanx. The use of this strong muscle is to bend the first
and second phalanges.

Flexor digitorum profundus.—Perforans.—Cubito-ph*-
langeus communis.—This muscle lies deeper than the former,
which it accompanies : it arises from the internal surface of
the ulna, and the interosseous ligament; divides into four
slips, whose tendons pass under the annular ligament, perfo-
rate those of the flexor sublimis, and are inserted into the fore
part of the lastphalaux of the fingers. It bends the last joint
of the fingers.

Flexor loxgus pollicis.—Radio-phttlungeus pollicis.
Flexor tertii internodH.—This muscle runs by the inside of the
radius, arising from it, and the interosseous ligament; it has
often, also, another head from the condyle of the humerus,
and fore part of the ulna. It passes under the annular liga-
ment, and is inserted into the last bone of the thumb. It
bends the thumb.

Pronator radii quadratus.—Cubito-vadialis.—This lies
flat upon the interosseous ligament in the fore part of the
arm, about two inches above the wrist. It is nearly square,
its fibres going across between the radius and ulna. It turns
the radius upon the ulna.

MUSCLES SITUATED CHIEFLY ON THE HAND.

Lumbricales.—J^ahno-yhalangeus. Musculi fidmnalcs,
X'u»jr round small muscles, resembling earth-worms. They
 
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