#pouch.sac__pocket  (anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican)
  supertype:  sac  a structure resembling a bag in an animal
  subtype:  gizzard__ventriculus__ventriculu__gastric_mill__gastricmill  thick-walled muscular pouch below the crop in many birds and reptiles for grinding food
  subtype:  utricle__utriculus__utriculu  a small pouch into which the semicircular canals open
  subtype:  atrial_auricle__auricle__auriculaatrii  a small conical pouch projecting from the upper anterior part of each atrium of the heart
  subtype:  auricula__auricular_appendage__auricularappendage__auricular_appendix__auricularappendix  a pouch projecting from the top front of each atrium of the heart
  subtype:  cheek_pouch__cheekpouch  a membranous pouch inside the mouth of many rodents (as a gopher)
  subtype:  marsupium  an external abdominal pouch in most marsupials where newborn offspring are suckled
  subtype:  scrotum  the external pouch that contains the testes

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