What is the term for the dilated portion of the duct located close to the nipple?

The correct term for the dilated portion of the duct located close to the nipple is the lactiferous sinus. This structure acts as a reservoir for milk as it exits the mammary glands and enters into the nipple during lactation. The lactiferous sinuses are part of the mammary duct system that facilitates the transport of milk from the ducts to the nipple for breastfeeding.

Understanding the role of the lactiferous sinus is crucial in recognizing how it contributes to lactation, as it helps manage the flow of milk, allowing for effective breastfeeding. This knowledge is essential for those involved in mammography and breast health, as alterations or abnormalities in this area can impact breastfeeding and may be indicative of various breast health issues.

While the other options mention potential anatomical or functional components, they do not specifically refer to the recognized term for this particular dilated duct area near the nipple. For example, sinus ampulla and ductal dilation are more generic terms that do not specifically indicate a location in relation to the nipple, and the ampulla of Goins is not a standard term used in the context of breast anatomy.