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. 2021 May 7;100(18):e25812. doi: 10.1097/MD.0000000000025812

Figure 2.

Figure 2

Ultrasonography at the predetermined sites for cross-sectional area in the radial, musculocutaneous, lateral and medial antebrachial cutaneous nerve. Radial nerve at the level above the spiral groove (A), spiral groove (B), and antecubital fossa (C). Posterior interosseous nerve (D) and superficial radial sensory nerve (E) in the proximal forearm. Musculocutaneous nerve in the axilla (F). Medial antebrachial cutaneous nerve in the arm (G). Lateral antebrachial cutaneous nerve in the elbow (H). BB = biceps brachii, BR = brachioradialis, Br = brachialis, BV = basilica vein, CV = cephalic vein, ECRL = extensor carpi radialis longus, H = humerus, Su = supinator, TR = triceps.