Medical Definition of Acinus, pulmonary

  • Medical Author:
    William C. Shiel Jr., MD, FACP, FACR

    Dr. Shiel received a Bachelor of Science degree with honors from the University of Notre Dame. There he was involved in research in radiation biology and received the Huisking Scholarship. After graduating from St. Louis University School of Medicine, he completed his Internal Medicine residency and Rheumatology fellowship at the University of California, Irvine. He is board-certified in Internal Medicine and Rheumatology.

Reviewed on 12/27/2018

Acinus, pulmonary: The ending of a tiny airway in the lung, where the alveoli (air sacs) are located.

In anatomy, an acinus is a round cluster of cells, usually epithelial cells, that looks somewhat like a knobby berry.

The word "acinus" means "berry" in Latin. (The plural is "acini".) There are also acini, round clusters of epithelial cells, in the salivary glands and in the pancreas.

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Reviewed on 12/27/2018