8 – Anatomy: Cutaneous innervation of the branches of the intercostal nerves

The lateral cutaneous branches (syn: lateral mammary branches) of the intercostal nerves innervate the skin of the axilla (the intercostobrachial nerve, which is the lateral cutaneous branch from intercostal nerve T2 innervates part of the skin of the axilla and continues to innervate the skin of the proximal medial surface of the arm) and the lateral part of the breast

The anterior cutaneous branches (syn: medial cutaneous branches or medial mammary branches) of the intercostal nerves innervate the supero-medial part of the breast