Anatomical Enclosures
- Amniotic sac
- Anal glands or anal sac
- Bursa (anatomy) or Bursa sac
- Chorion
- Dural sac, a structure of spinal cord
- Egg sac, the reproductive structure of spiders
- Fecal sac
- Gestational sac
- Greater sac
- Gular skin or throat sac
- Ink sac
- Lacrimal sac, eye-and-nose-associated structure
- Lesser sac
- Ovule or embryo sac
- Pleural cavity or pleural sac
- Synovial sac, joint component
- Venom sac, in venom-secreting animals
- Vestibular sacs (disambiguation), various meanings
- Viscid sac
- Vocal sac
- Yolk sac
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