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Local anesthetic administered into the interfascial plane likely reached the axilla via an axillary port, easily blocking the intercostobrachial and medial brachial cutaneous nerves, which innervate the axillary area.
The medial brachial cutaneous nerve innervates the skin of the posteromedial arm down to the level of the olecranon.
The posterior branch sends several smaller branches to the teres minor, the deltoid, and the superior lateral brachial cutaneous nerve. The anterior motor branch courses around the neck of the humerus and passes medially on the anterior surface of the surgical neck to supply the middle and anterior deltoid heads.