, which appears to me as being most inclusive of all
their various conditions, is this--viz., that the point of division into
radial, ulnar, and interosseous, which F, Plate 16, usually marks, may
take place at any part of the member between the bend of the elbow and
the coracoid process in the axillary space.

At the bend of the elbow, the brachial artery usually occupies the
middle point between e, the inner condyle of the humerus and the
external margin of the supinator radii longus muscle, G. The structures
which overlie the arterial vessel, C, Plate 16, at this locality,
numbering them from its own depth to the cutaneous surface, are these--
viz., some adipose cellular membrane envelopes the vessel, as it lies on
E, the brachialis anticus muscle, and between the two accompanying
veins; at the inner side of the artery, but separated from it by a small
interval occupied by one of the veins, is situated the median nerve d,
Plate 15. Above all three structures is stretched that dense fibrous
band of the fascia, H, Plate 16, which becomes incorporated with the
common fascial covering of the forearm. Over this fascial process lies
the median basilic vein, F B, Plate 15, accompanying which are seen some
branches of the internal cutaneous nerve. The subcutaneous adipose
tissue and common integument cover these latter. If it be required to
ligature the artery at this locality, an incision two inches and a half
in length, made along the course of the vessel, and avoiding the
superficial veins, will expose the fascia; and this being next divided
on the director, the artery will be exposed resting on the brachialis
anticus, and between the biceps tendon and pronator teres muscle. As
this latter muscle differs in width in several individuals, sometimes
lying in close contact with the artery, and at other times leaving a
considerable interval between the vessel and itself, its outer margin is
not, therefore, to be taken as a sure guide to the artery. The inner
border of the biceps indicates much more generally the situation of the
vessel.

The bend of the elbow being that locality where the operation of
phlebotomy is generally performed, it is therefore required to take
exact account of the structures which occupy this region, and more
especially the relation which the superficial veins hold to the deeper
seated artery. In Plate 15, the artery, C, is shown in its situation
beneath the fascial aponeurosis, which comes off from t