21. The radial nerve follows the humerus closely. 22. It consists of a central nerve ring surrounding the mouth, and radial nerves branching into the arms. 23. The remaining extrinsic hand extensors are supplied by the posterior interosseus nerve, another branch of the radial nerve . 24. Wrist drop is also associated with lead poisoning because of the effect of lead on the radial nerve . 25. The ring nerves and radial nerves have sensory and motor components and coordinate the starfish's balance and directional systems. 26. The muscles of this compartment are the triceps brachii and anconeus muscle and these are innervated by the radial nerve . 27. Compression of the radial nerve causes numbness of the back of the hand and thumb, and is much more rare. 28. Common nerve injuries that are treated with tendon transfer surgery are spinal cord, radial nerve , ulnar nerve, or median nerve injury. 29. Similar problems can affect the ulnar nerve, which runs through the elbow, and another nerve in the arm, the radial nerve . 30. About six months before that she was hit by a car and severely injured the radial nerve in her right arm.
