THE UPPER EXTREMITY across the hollow in front of the elbow nearly to
it&
insertion.
The Semilunar fascia (Figs. 24, 26, 28) is a thin but strong fibrous expansion from the biceps in the upper part of the front of the forearm, extending from the inner border of the tendon of the biceps downwards and inwaids to join the deep fascia of the
Fig.
29.— The Outer Side of the Right Upper Extremity.
forearm, and indenting transversely the mass of muscles which arises from the internal condyle of the
humerus. On each side of the biceps
is
a groove (Fig. 26)
;
in
the outer lies the cephalic vein, in the inner the basilic vein and brachial artery, the latter more deej)ly situated, but visible sometimes in thin old l^ersons, and especially if it is tortuous. Lying behind the biceps on the inner side of the arm is the inner head of the Triceps, which arises from the humerus all the way from the lower border 85