Striated duct

Striated duct is a part of the salivary gland system in the human body. It is a component of the exocrine glands, which are glands that produce and secrete substances onto an epithelial surface by way of a duct.

Function

The primary function of the striated duct is to modify the ionic composition of the saliva secreted by the salivary gland. This is achieved through the reabsorption of sodium ions and the secretion of potassium ions. The striated duct also plays a role in the reabsorption of water, helping to concentrate the saliva.

Structure

The striated duct is characterized by its basal striations, which are caused by the infoldings of the basal membrane containing mitochondria. These infoldings increase the surface area for ion transport, which is essential for the modification of saliva. The duct is lined by a simple columnar epithelium, which is a type of tissue that forms a single layer of cells.

Clinical significance

Diseases and conditions that affect the striated duct can impact the production and composition of saliva, leading to symptoms such as dry mouth. These conditions include Sjögren's syndrome, a chronic autoimmune disease that affects the salivary and other exocrine glands.

See also

• Salivary gland
• Exocrine gland
• Sjögren's syndrome