Anatomy A penetrating wound to the axilla which severs the posterior cord of the brachial plexus would denervate the? A Serratus anterior B Pronator Teres C Deltoid D Biceps brachii 💡 Explanation A penetrating wound to the axilla which severs the posterior cord of the brachial plexus would denervate the? ✓ Correct Answer: C. Deltoid