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17 Subcategories

• yolk sac go
  membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes
  
• yolk sac, vitelline sac, umbilical vesicle, vesicula umbilicus go
  membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
  
• amnion, amniotic sac, amnios go
  thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
  
• chorion go
  the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
  
• coelenteron go
  the saclike body cavity of a coelenterate
  
• air bladder, swim bladder, float go
  an air-filled sac near the spinal column in many fishes that helps maintain buoyancy
  
• air sac go
  any of the membranous air-filled extensions of the lungs of birds
  
• air sac go
  any of the thin-walled extensions of the tracheae of insects
  
• saccule, sacculus go
  a small sac or pouch (especially the smaller chamber of the membranous labyrinth)
  
• bladder, vesica go
  a distensible membranous sac (usually containing liquid or gas)
  
• acinus go
  one of the small sacs or saclike dilations in a compound gland
  
• bursa go
  a small fluid-filled sac located between movable parts of the body especially at joints
  
• cistern, cisterna go
  a sac or cavity containing fluid especially lymph or cerebrospinal fluid
  
• pocket, pouch go
  (anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican)
  
• vesicle, cyst go
  a small anatomically normal sac or bladderlike structure (especially one containing fluid)
  
• air sac, alveolus, air cell go
  a tiny sac for holding air in the lungs
  
• pericardial sac go
  the membrane surrounding the heart