What is acinus in liver?
The acinus is a unit that contains a small portal tract at the center and terminal hepatic venules at the periphery. It is the smallest functional unit and is divided into zones 1, 2, and 3, wherein zone 1 surrounds the portal tract and zone 3 surrounds the hepatic venule.
Is the lobule and acinus are same?
The lobule may be thought of as a hexagon with a central vein at its centre and a portal triad at its outer corners. The acinus is elliptical in shape and consists of a central vein at each pole and a portal triad at the centre.
What is the function of acinus?
The pancreatic acinar cell is the functional unit of the exocrine pancreas. It synthesizes, stores, and secretes digestive enzymes. Under normal physiological conditions, digestive enzymes are activated only once they have reached the duodenum.
What are the parts of acinus?
The acinus is the basic functional unit of the exocrine pancreas. It is composed of acinar cells, centroacinar cells, and duct cells (Fig. 1). A connective tissue matrix, including a basal lamina, surrounds the acinus, but does not insert itself between individual acinar cells.
What does acinus mean in biology?
Definition of acinus : any of the small sacs terminating the ducts of some exocrine glands and lined with secretory cells.
Is an acinus and alveoli?
The system that starts at the respiratory bronchiole and terminates at the alveoli is called an acinus, and it is functionally characterized by having the ability to both conduct air as well as enable gas exchange.
What is acinus of a compound gland?
An acinus (from Latin, grape) is a small ball of secretory epithelial cells containing a tiny central lumen. Acini are usually formed by serous cells. [Acini are sometimes called alveoli, from L., small cavity.]
What is the difference between liver lobule and hepatocyte?
Liver lobules are collections of hepatocytes in a hexagonal shape with the center being a central vein. Within the lobules, the hepatocytes are arranged in cords, and in between the cords is a vascular space with a thin fenestrated endothelium and a discontinuous membrane called a sinusoid.
What is lobe and lobule?
The lobes are further divided into segments and then into lobules, which are hexagonal divisions of the lungs that are the smallest visible subdivision. The lobes are further divided into segments and then into lobules, hexagonal divisions of the lungs that are the smallest subdivision visible to the naked eye.
What is the difference between the acinus and the lobule?
The acinus is more difficult to visualize than the lobule, but represents a unit that is of more relevance to hepatic function because it is oriented around the afferent vascular system.
What is the meaning of the medical term acinus?
[as´ĭ-nus] (pl. a´cini) (L.) any of the smallest lobules of a compound gland. liver acinus the smallest functional unit of the liver, a mass of liver parenchyma that is supplied by terminal branches of the portal vein and hepatic artery and drained by a terminal branch of the bile duct.
What is the difference between acinus and lung?
acinus A small, sac-like out-pouching of a compound gland, as in the breast, pancreas, salivary glands and thyroid. Lung A sub-segmental lung structure which, with the primary pulmonary lobule, is the smallest unit of lung tissue. It consists of a terminal bronchiole and the lung parenchyma that arises from it. Acinus
What is the function of the liver acinus?
liver acinus the smallest functional unit of the liver, a mass of liver parenchyma that is supplied by terminal branches of the portal vein and hepatic artery and drained by a terminal branch of the bile duct. Liver acinus: hepatic lobules are represented by hexagons (solid lines); liver acinus is represented by rhombus (dotted line).