alimentary system
  upper digestive tract
 mouth
 - lip
  - tongue
  - ::: human tongue (filiform papillae) (HSM0134, Masson trichrome)
  - ::: calf tongue (circumvallate papillae) (HSM0146, HE & saffron)
  - ::: ox tongue (filiform papillae) (HSV0042, HE & saffron)
  - ::: ox tongue (lentiform papillae) (HSV0044, HE & saffron)
  - ::: dog tongue (filiform & fongiform papillae) (HSV0038, Masson trichrome)
  - ::: rabbit tongue (anterior) (HSM0137, HE & saffron)
  - ::: rabbit tongue (posterior - foliate papillae) (HSM0145, HE & saffron)
  - ::: pig tongue (lingual tonsils) (HSV0027, Masson trichrome)
  - ::: pig tongue (filiform & fongiform papillae) (HSV0040, HE & saffron)
  - ::: chicken tongue (HSV0052, HE & saffron)
  - ::: trout tongue (HSV0060, HE & saffron)
  - ::: rat tongue (HGM0010, toluidine blue)
  - ::: rat tongue (HGM0013, laminin immunohistochemistry)
  
 - tooth
  epiglottis
  oesophagus
  - bird crop
  - fish swim bladder
  stomach
  - ::: human stomach (pyloric region or antrum) (HSM0158, HE & saffron)
  - ::: human stomach (fundus) (HSM0156, HE & saffron)
  - ::: human stomach (fundus, endoscopic biopsy) (HSM0160, HE & saffron)
  - ::: rat stomach + oesophagus and duodenum (HSV0049, HE & saffron)
  - ::: chicken proventriculus and oesophagus (HSV0078, HE & saffron)
  - ::: chicken ventriculus (gizzard) (HSV0079, HE & saffron)
  - ::: trout stomach (HSV0081, HE & saffron)
  - ::: ox stomach (reticulum) (HSV0076, HE & saffron)
  - ::: ox stomach (rumen) (HSV0075, HE & saffron)
  - ::: ox stomach (omasum) (HSV0077, HE & saffron)
  - ::: ox stomach (abomasum) (HSV0071, HE & saffron)
  - ::: horse antrum (HSV0074, HE & saffron)
  - ::: horse fundus (HSV0073, HE & saffron)
  - ::: dog fundus and antrum (HSV0072, HE & saffron)
  
 lower digestive tract
 small intestine
 - duodenum
  - jejunum - ileon
  large intestine
 - colon
  - appendix
  anorectal region