#vesicle__cyst  a small anatomically normal sac or bladderlike structure (especially one containing fluid)
  supertype:  sac  a structure resembling a bag in an animal
  subtype:  lacrimal_sac__tear_sac__dacryocyst  either of the two dilated ends of the lacrimal ducts at the nasal ends of the eyes that fill with tears secreted by the lacrimal glands
  subtype:  Golgi_body__Golgi_apparatus__Golgi_complex__dictyosome  a net-like structure in the cytoplasm of animal cells (especially in those cells that produce secretions)
  subtype:  blister__bulla__bleb  (pathology) an elevation of the skin filled with serous fluid
     subtype:  water_blister__waterblister  blister containing a nonpurulent clear watery content
     subtype:  blood_blister__bloodblister  blister containing blood or bloody serum usually caused by an injury
  subtype:  follicle  any small spherical group of cells containing a cavity
     subtype:  hair_follicle  a small tubular cavity containing the root of a hair; small muscles and sebaceous glands are associated with hair follicles
     subtype:  Graafian_follicle  a vascular body in a mammalian ovary enclosing a developing egg
  subtype:  seminal_vesicle__seminalvesicle  adds nutrient fluid to semen during ejaculation

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