An intralobular duct is the portion of an exocrine gland

Exocrine gland

Exocrine glands are a type of ductal glands that secrete their products into ducts that lead directly into the external environment...

 inside a lobule, leading directly from acinus

Acinus

An acinus refers to any cluster of cells that resembles a many-lobed "berry," such as a raspberry...

 to interlobular duct

Interlobular duct

An Interlobular duct is a gland duct which connects more than one lobule. It is smaller than an interlobar duct.Examples of where it can be found include* pancreas* mammary gland* parotid gland...

. It is composed of two subdivisions, the intercalated duct

Intercalated duct

The intercalated duct, also called intercalary duct, is the portion of an exocrine gland leading directly from the acinus to a striated duct. The intercalated duct forms part of the intralobular duct...

 and the striated duct

Striated duct

A striated duct is a gland duct which connects an intercalated duct to an interlobular duct. It is characterized by the basal infoldings of its plasma membrane, characteristic of ion-pumping activity by the numerous mitochondria...

.

In the human mammary gland, the intralobular duct is a part of the glandular system that resides within the lobules. Lobules contain clusters of ducts whose secretory alveolies are drained by the intralobular duct. The intralobular ducts are usually lined with simple cuboidal epithelial cells that are lined by myoepithelial cells as well.

The intralobular ducts of the lobules drain into the interlobular ducts between lobules.

They can be seen in:

• pancreas
  Pancreas
  The pancreas is a gland organ in the digestive and endocrine system of vertebrates. It is both an endocrine gland producing several important hormones, including insulin, glucagon, and somatostatin, as well as a digestive organ, secreting pancreatic juice containing digestive enzymes that assist...
  
  

• salivary glands