"Each lobe of the breast is drained by a collecting duct terminating in the nipple. The collecting duct drains several side branches, each arising from a terminal duct lobular unit (TDLU), the basic functional and histopathological unit of the breast. The terminal duct lobular unit is composed of a small segment of the terminal duct and a cluster of ductules, which are the effective secretory units. The functional structures are surrounded by specialised connective tissue. A normal terminal ductal lobular unit ranges from 1-4 mm."
Expected headings
"Function"