Medial mammary branches of intercostal nerve

Near the sternum, the anterio rami of the intercostal nervex cross in front of the internal mammary artery and Transversus thoracis muscle, pierce the Intercostales interni, the anterior intercostal membranes, and Pectoralis major, and supply the integument of the front of the thorax and over the mamma (medial mammary branches), forming the anterior pectoral cutaneous branches of the thorax; the branch from the second nerve unites with the anterior supraclavicular nerves of the cervical plexus.