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alveolar sac



  1. terminal dilation of the alveolar ducts, which give rise to alveoli in the lung; a small air chamber in the pulmonary tissue from which the pulmonary alveoli project like bays and into which an alveolar duct opens;
  2. in birds, air-containing extensions of bronchi that connect with bone cavities.

Synonym(s): sacculus alveolarisTA

Further information

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© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.