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Mammary Glands
...  muscles. The mammary alveoli secrete the milk into a network of mammary ducts. This network is also made up of lactiferous ducts. The lactiferous ducts expand into the body’s lumen beside each nipple. The milk is kept in place by the lactiferous sinuses, and when pressure is exerted, the milk is expelled through the tip of the nipple into the outside of the body. The nipples are made up of  ...

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