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Anterior brachial muscles
Muscle cells from the ventral part of the somite migrate anterior to the developing humerus to form the anterior brachial compartment muscles. The three muscles that arise from this embryonic muscle – the coracobrachialis, the biceps brachii, and the brachialis – share common attachments, actions, vascularization, and innervation. They share common origins from the coracoid process and adjacent areas of the scapula, while they insert near each other at the proximal, anterior end of the of the antebrachial bones. Their common actions are flexion of both shoulder and elbow. They are all innervated by the musculocutaneous nerve and receive their vascular supply from the brachial artery and its branches.