Medial Artery Supplying the Mammary Gland, Gross Anatomy

Description

Running along the parasternal margin, the medial mammary arterial supply courses anterior to the chest wall and sends perforating branches laterally into the glandular parenchyma, passing through fibrous septa between lobules of adipose tissue. Lobules and lactiferous ducts occupy the superficial plane deep to the skin, while the retromammary space separates the posterior breast from the fascia over pectoralis major. Venous channels accompany the arterial tree, draining back toward the internal thoracic and adjacent superficial veins. Fine arterioles arborize around lobules and ductal units. Medial arterial contribution matters because it explains why incisions and dissection near the sternum can change skin and nipple-areolar complex perfusion, and why bleeding during surgery often originates from parasternal perforators. This view also supports understanding tumor spread and post-treatment changes, since breast cancer commonly metastasizes along lymphatic routes that parallel vascular corridors, and radiotherapy planning often accounts for internal mammary chain involvement adjacent to the internal thoracic vessels. A practical landmark. When raising mastectomy flaps, preserving subdermal plexus fed in part by these medial perforators can reduce ischemia and wound complications. Educators can drop this plate into gross anatomy and breast surgery teaching sets to clarify layered anatomy, the relationship of the gland to pectoralis major, and the source of medial breast blood supply for reduction mammoplasty, mastectomy, or reconstruction planning. It also suits atlas figures and review articles discussing internal thoracic artery perforators, parasternal approaches, and vascular considerations in oncoplastic techniques. Anatomical accuracy verified by SciePro's Medical Advisory Board.