Mammary glands (breasts)

• A pair of mammary glands contains glandular tissue & fat.
• Glandular tissue of each breast has 15-20 mammary lobes containing clusters of cells (alveoli).
• The cells of alveoli secrete milk which is stored in the cavities (lumen) of alveoli.
• The alveoli open into mammary tubules.
• The tubules of each lobe join to form a mammary duct.
• Several mammary ducts join to form a wider mammary ampulla which is connected to lactiferous duct through which milk is sucked out.