With the pronator teres muscle reflected medially, identify the ulnar artery [probe; the median nerve is held by the retractor]. Immediately below the tuberosity of the radius, the common interosseous artery [at the tip of the probe in the middle of the field] arises from the ulnar artery. The common interosseous artery runs for approximately one centimeter and then divides into the anterior interosseous artery and posterior interosseous artery. The common interosseous artery may be very short [as is the case in this cadaver], and the anterior and posterior interosseous arteries may arise separately from the ulnar artery.
A variable branch, the median artery, may arise from the common interosseous artery. Distally the ulnar artery [probe to the right] passes deep to the flexor digitorum superficialis muscle.
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