Term: swim bladder mesenchyme
Name: swim bladder
Synonyms: gas bladder
Definition: The swim bladder is a double-chambered organ located in the coelom and used to maintain buoyancy and may function as an acoustic resonator. The zebrafish does not appear to have a gas gland, but it is not yet clear if there are gas producing cells distributed more widely.
Ontology: Anatomy Ontology [ZFA:0000076]

Name: mesenchyme
Synonyms:
Definition: A mesh-like cell arrangement, less compact than an epithelium.
Ontology: Anatomy Ontology [ZFA:0000393]