What is the difference between Interlobular and intralobular duct?
Intralobular ducts have a classical cuboidal epithelium and, as the name implies, are seen within lobules. They receive secretions from intercalated ducts. Interlobular ducts are found between lobules, within the connective tissue septae. They vary considerably in size.
What is an intralobular duct?
An intralobular duct is the portion of an exocrine gland inside a lobule, leading directly from acinus to an interlobular duct (between lobules). It is composed of two subdivisions, the intercalated duct and the striated duct.
What is the interlobular duct used for?
The interlobular ducts empty into a single pancreatic duct that joins with the duodenum. The epithelium of the intercalated ducts secretes fluid with a high concentration of sodium bicarbonate that serves to buffer acid arriving in the duodenum from the stomach.
What surrounds the interlobular duct?
The intralobular ducts fuse to form the interlobular ducts, which are found between lobules, within the connective tissue septa and surrounded by a rim of collagen (Figure 10).
Are Intralobular ducts striated?
Intralobular (striated) ducts are lined by cuboidal to low-columnar cells in mice and tall columnar cells with large, apically-located nuclei in humans. Both species have characteristic eosinophilic striations in the basal cytoplasm of the striated ducts (Figures 9 and 10).
What is the difference between serous and mucous acini?
serous acini – contain only serous cells and are generally spherical. mucous acini – contain only mucous cells and are generally tubular. mixed (or sero-mucous) acini -contain a mixture of serous and mucous cells.
What is intercalated duct?
The secretory acini in the salivary glands secrete into intercalated ducts (A). These ducts link the acinar lumen with the larger components of the duct system within the salivary gland. Several intercalated ducts are seen converging toward the center of the field.
Where is the Whartons duct?
major duct of each (Wharton’s duct) opens into the floor of the mouth at the junction where the front of the tongue meets the mouth’s floor. A capsule of tissue also surrounds each of these glands, which give off mixed secretions mostly serous in nature.
Why it is called striated duct?
Striated ducts assume their typical histological striated appearance and derive their name from numerous folds and invaginations of the apical plasma membrane, which is rich in various ion pumps.
What is the difference between serous and mucous secretions?
Mucus is a thick, clear, and somewhat slimy substance. Serous secretion is a more liquid opalescent fluid composed of water and proteins, such as the digestive enzyme amylase.