Cephalic vein Heads of Long biceps Short Musculocutaneous nerve Median nerve Brachialis Brachial artery Basilic vein UInar nerve Humerus Lateral intermuscular Medial intermuscular septum septum Brachial fascia Radial nerve Deep brachial artery and veins Lateral Heads of B Medial triceps bl ong (二)深层结构ε臂筋膜 brachial fascia,骨筋膜鞘及其 内容 osseofibrous sheath and its contents（二）深层结构：臂筋膜brachial fascia, 骨筋膜鞘及其 内容 osseofibrous sheath and its contents