Question: action of the triceps brachii muscle at the elbow includes
Answer: Details Origin Long head : infraglenoid tubercle of scapula Lateral head : above the radial sulcus Medial head : below the radial sulcus Insertion Olecranon process of ulna Artery Deep brachial artery Nerve Radial nerve and Axillary nerve Actions Extends forearm , long head extends , adducts arm , Extends shoulder Antagonist Biceps brachii muscle Identifiers Latin Musculus triceps brachii Dorlands / Elsevier m_22 / 12551300 TA A04.