The mammary gland is made up of lobules, glandular structures that produce milk in females when stimulated to do so. The lobules drain into a system of ducts, connecting channels that transport the milk to the nipple. Between the glandular tissue and ducts, the breast contains fat tissue and connective tissue.Breast facts · What are the anatomical · What happens to the. Breast development and function depend on hormone production from the ovaries. Learn more from Cleveland Clinic about the anatomy of the breast. Find the latest information on Women's Health, including the use of minimally invasive.