Breast

The breast lies on the pectoral fascia; its lymphatic drainage governs cancer spread and is a classic exam topic. STRUCTURE • Modified sweat gland; 15–20 lobes drained by lactiferous ducts → ampullae → nipple. • Extends from the 2nd–6th ribs, sternum to mid-axillary line; the axillary tail (of Spence) pierces the deep fascia. • Suspensory ligaments of Cooper anchor it to the skin (their tetheri…