Skip to Content
Medical Term:

air bladder


a gas-filled sac that is present in most fish and functions as a hydrostatic organ; it is located beneath the vertebral column primarily in the anterior abdomen and is connected with the esophagus in some species (goldfish). Oxygen is transferred from a rich venous sinus into the swim bladder to increase buoyancy.

Synonym(s): swim bladder

© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.