Milk ducts are small tubes in the breasts that carry milk from the mammary glands to the nipple. They play a crucial role in breastfeeding, allowing mothers to feed their infants. Each breast contains multiple milk ducts, which can expand and contract to help regulate milk flow. During pregnancy and breastfeeding, the milk ducts undergo changes to prepare for milk production. Hormones like prolactin stimulate the mammary glands, while oxytocin helps with the release of milk during nursing. Proper functioning of milk ducts is essential for successful breastfeeding and infant nutrition.