It is the longest bone in the upper limb. The supraspinatus (m. supraspinatus), the infraspinatus (m. infraspinatus) and the lesser round muscle (m. teres minor) are attached to its greater tubercle. The subscapular muscle (m. subscapularis) is attached to the lesser tubercle. In the middle of the shaft, the deltoid muscle (m. deltoideus) is attached on the lateral side, and the corobrachial muscle (m. coracobrachialis) is attached to the medial side. In the distal epicondyle on the lateral epicondyle are attached the lateral muscles of the forearm, the long radial extensor muscle of the wrist (m. extensor carpi radialis longus), the short radial extensor muscle of the wrist (m. extensor carpi radialis brevis), the invertor muscle (m. supinator), and the extensor muscle of the fingers (m. extensor digitorum). On the lateral edge of the bone, there is the brachial-radial muscle (m. brachioradialis).