Fig. 22

Sonoanatomy of the medial antebrachial cutaneous nerve. Short-axis views of the medial antebrachial cutaneous nerve from the axilla to the elbow. A The medial antebrachial cutaneous nerve at the axilla appearing as a small honeycomb structure lying underneath the brachial fascia superior to the axillary artery in the space between the median and ulnar nerves. Note the orientation of the median, ulnar, and radial nerves around the axillary artery and veins. B The medial antebrachial cutaneous nerve just distal to the axilla coursing superomedial to the axillary vein. C The medial antebrachial cutaneous nerve at the mid-arm level seen coursing adjacent to the basilic vein and both are running medial to the median nerve and brachial artery. Note the median nerve as it crosses over the brachial artery at the same level. D The medial antebrachial cutaneous nerve at the medial aspect of the antecubital fossa showing the anterior branch of the nerve running in the subcutaneous tissue layer adjacent to the basilic vein which is used as the anatomical landmark to identify the nerve