Colon

Crypts of Lieberkuhn

Mucosa

GI Tract

MucosaSubmucosaCircular Portion of the

Muscularis Externum

Longitudinal Portion of the

Muscularis Externum

Mesothelium

Simple Squamous Epithelium Cells

Esophagus

Epithelium

Lamina Propria

Muscularis MucosaMucosa

Submucosa (connective tissue)

Circular Portion of the

Muscularis Externum

Longitudinal Portion of the

Muscularis Externum

MuscularisExternum

Transition Between Esophagus & Cardiac Portion of the Stomach

Esophagus Cardiac Portionof the Stomach

Stratified SquamousEpithelium

Simple ColumnarEpithelium

MucosalGlands

Stomach

Mucosa

Submucosa

MuscularisExternum

Stomach

Gastric Gland

Pits

Simple ColumnarEpithelium

Pyloric Portion of the Stomach

PyloricGlands

LaminaPropria

MuscularisMucosa

Submucosa

Transition for Pylorus to Duodenum

Pylorus Duodenum

Glands ofBrunner

Duodenum (Small Intestine)

Villi

Crypts ofLieberkuhn

Submucosa

MuscularisExternum

Duodenum (Small Intestine)

Crypts ofLieberkuhn

Submucosa

Glands of Brunner(Secrete alkaline mucus &found only in duodenum)

Cross-Section of Crypts

Crypts ofLieberkuhn(secretesintestinaldigestiveenzymes &mucus

LaminaPropria

Jejunem (Small Intestine)

Villi (increases surface area)

Crypts ofLieberkuhn

Cross-Section of Villi

Muscularis Mucosa

Circular Portion of the

Muscularis Externum

Longitudinal Portion of

the Muscularis Externum

Villi

Crypts ofLieberkuhn

Cross-Section of Villi

LaminaPropria

Goblet Cells(secret mucusFor lubrication)

Jejunem (Small Intestine)Villi

Mucosa

Submucosa

Ileum (Small Intestine)

Crypts ofLieberkuhn

Peyer’s Patches(dense lymphatictissue; located insubmucosa)

Appendix

Fat Cells

Crypts ofLieberkuhn

Appendix

Crypts ofLieberkuhn

Goblet Cells

Lymphocytes(in LamniaPropria)

Colon

Serosa (finished edge;if the organ is against thebody cavity wall then a serosa is not needed)

Muscularis Externum

CircularPortion

LongitudinalPortion

Aurbach’sMyentericPlexus

Aurbach’s Plexus

Neurons (Dark Spots)