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C 59 )

for tlie anconoid process of the ulna; and an anterior deprcs~.
sion, for the coronoid process, and end of the radius.

Connexion. The humerus is connected with three bones ;
with the scapula by arthrodia, and the cubit and radius by
ginglymus.

Use. To constitute the arm.

Tliis bone is perfect in its shape at birth, but its extremi-
ties are cartilage.

THE FORE-ARM.

The fore-arm is composed of two bones, the ulna and ra-
dius : the first forms the internal and posterior part, and the
second the external and anterior part.

ULNA.

Facile majus. Cubitus. Canna major.

This bone is long, and thicker above than below. It is
placed in the inside of the fore-arm, from the elbow towards
the little finger.

Eminences. The olecranon, or anconoid process, situated
posteriorly, and upon which we lean : it has a considerable tu-
berosity on its back part, for the insertion of the triceps ex-
tensor cubiti. The coronoid process, which is opposite to 'he
former, has a tubercle that gives adhesion to the brachialis
internus muscle, and has externally a semilunar cavity, called
the lesser sigmoid, for the head of the radius. In the lo^cr
extremity are, the lower head, the neck, and the styloid process,
which gives a strong adhesion to the ligament that secures the
wrist. The body of the ulna is somewhat triangular; its ex-
ternal, aud internal surfaces are flat, and separated by a sharp

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