The structure outside the lobule that connects to the lactiferous duct and the lactiferous sinus just inside the nipple is which of the following?

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Milk is produced in the lobules and drained by small ducts that leave the lobule and fuse into larger channels outside the lobule. This outside-the-lobule conduit is called the extralobular terminal duct, also known as the segmental duct. It connects the secretory units to the lactiferous ducts, which run toward the nipple and culminate in the lactiferous sinus just inside the nipple. So the structure described is the extralobular terminal duct (segmental duct).