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Next, cut through the bicipital aponeurosis located on the medial side of the tendon of the biceps muscle. The bicipital aponeurosis is a strong triangular band of connective tissue which protects the underlying nerves and vessels. Reflect the distal portion of the biceps brachii muscle inferiorly and identify the tendon of biceps brachii muscle which attaches to the tuberosity of the radius. On the medial side of the tendon, identify the median nerve [held by retractor] and brachial artery [held by forceps] which are structures that lie deep to the bicipital aponeurosis.If the superficial veins have not been removed, identify the cephalic, basilic, and median cubital veins located superficial to the bicipital aponeurosis. Clinically, the median cubital vein is often used as a site to obtain venous blood samples.
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