Acinus

Acinus

Illustrated section of pancreas of dog. X 250. (Alveolus labeled at center top.)

Centroacinar cells
Identifiers
Code TH H2.00.02.0.03050

Anatomical terminology

human acinar cells

An acinus (/ˈæsnəs/; plural, acini; adjective, acinar /ˈæsnər/ 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

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.

Lungs

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

See also

Look up acinus in Wiktionary, the free dictionary.

References

  1. Histology image: 51_07 at the University of Oklahoma Health Sciences Center - pyloric stomach
  2. Histology image: 46_03 at the University of Oklahoma Health Sciences Center - 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.


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