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This is an image showing breast anatomy and histology. It contains the following text: The breast is composed of glandular and stromal tissue. Glandular tissue includes the ducts and lobules. Stroma comprises area between lobes. Each lobe drains into a major lactiferous duct that dilates into a lactiferous sinus beneath the areola opening onto the nipple. Each terminal duct lobular unit is composed of branched tubuloalveolar glands organised into lobes. Inner layer of myoepithelial cells provide structural support to the lobules and assist in milk ejection during lactation. Outer layer of lobular luminal epithelial cells produce milk during lactation.