The ductal system refers to a network of tubes or channels in the body that carry fluids, such as saliva, sweat, milk, or other substances. These tubes help transport these fluids from one place to another inside the body. Full definition
Inside the bud, a rudimentary mammary ductal system is formed, which is present at birth. (emedicine.medscape.com)
Delous M., Yin Ch., Shin D., Ninov N., Debrito Carten J., Pan L., P. Ma T., Farber S., Moens C., Stainier D.Y.R sox9b is a key regulator of pancreaticobiliary ductal system development. (dresden-ipp.de)
During puberty the breast begins to enlarge through the formation of adipose tissue and the branching and elongation of the ductal system. (medela.com)