Acinus

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Acinus
Gray1105.png
Illustrated section of pancreas of dog. X 250. (Alveolus labeled at center top.)
Centroacinar cells.jpg
Centroacinar cells
Code TH H2.00.02.0.03050

An acinus (/ˈæsɨnɨs/) (plural, acini; adjective, acinar [/ˈæsɨnər/] or acinous) refers to any cluster of cells that resembles a many-lobed berry, such as a raspberry (acinus is Latin for "berry"). The berry-shaped termination of an exocrine gland, where the secretion is produced, is acinar in form, as is the alveolar sac containing multiple alveoli in the lungs.

Exocrine glands[edit]

Acinar exocrine glands are found in many organs, including:

The thyroid follicles can also be considered of acinar formation but in this case the follicles, being part of an endocrine gland, act as a hormonal deposit rather than to facilitate secretion.
Mucous acini usually stain pale, while serous acini usually stain dark.
The term "acinus" is considered synonymous with alveolus by some sources, but not all.

human acinar cells

Lungs[edit]

The respiratory bronchioles in the lungs terminate in acini, many-lobed sacs containing groupings of alveoli.

See also[edit]

References[edit]

  1. ^ Histology at OU 51_07 - pyloric stomach
  2. ^ Histology at OU 46_03 - sublingual gland
  3. ^ Histology image:10405loa from Vaughan, Deborah (2002). A Learning System in Histology: CD-ROM and Guide. Oxford University Press. ISBN 978-0195151732. 

External links[edit]