LKnative - Radial nerve block

4 – Anatomy: The upper part of the radial nerve

The radial nerve descends in the posterior compartment of the arm in the humeral sulcus (= the spiral or radial groove of the humerus)

When it emerges from the lateral end of the sulcus it pierces the lateral intermuscular septum and enters the anterior compartment of the arm

Here it descends between the brachial and brachioradial muscles across the lateral epicondyle of the humerus to the forearm

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Posterior cord of the brachial plexus (red arrow), radial nerve (blue arrows), posterior brachial cutaneous nerve (cyan arrow), inferior lateral brachial cutaneous nerve (magenta arrow), posterior antebrachial cutaneous nerve (orange arrow), the radial nerve in the humeral sulcus (black arrow)