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The structure that leads to the mammary glands is known as the mammary papilla. This term specifically refers to the projecting part of the mammary gland from which milk is excreted during lactation.

The mammary papilla serves as the outlet for milk to flow from the mammary glands and is crucial for nursing offspring. It's important to understand that this structure can be referred to colloquially as a "nipple," but the scientific and anatomical term used in the context of animal science is "mammary papilla." This distinction is essential for clear communication in the field.

The teat is also associated with the mammary gland but typically refers to the entire structure that includes the mammary papilla and surrounding tissue. In contrast, the areola generally describes the pigmented area surrounding the mammary papilla, which does not play a direct role in the flow of milk. Therefore, using the precise term, "mammary papilla," accurately conveys the function and structure related to milk delivery in mammals.