A cluster of TDLU is seen at higher magnification from the previous slide. Note how the TDLU radiate around the small duct like spokes of a wheel. That architecture will allow the TDLU to expand in all directions during physiological hyperplasia of pregnancy and lactation.
|| This diagram shows
the branching ducts (D) and the extralobular terminal ducts (ETD). From
the intralobular part of the terminal duct (ITD) ductules (DTL) develop
like test tubes as blindly ending structures. 30-50 ductules are present
in each lobule (L) and can be likened to the delicate petals of a daisy.
Note that the lobules have varying degrees of development that has been
classified by Drs. Russo as LOBULE TYPE 1 - 3.