Digestive System Histology and Models

Glands and Tonsils on the Models

• Submandibular gland

• Sublingual gland

• Parotid gland

• Palatine tonsil

• Pharyngeal tonsil

Glands

• Parotid gland

• Submandibular

Glands

Sublingual

Submandibular

Pharyngeal tonsil

Palatine tonsil

StomachFundus region

Pyloric region

Cardiac region

Greater curvature

Lesser curvature

Body region

Stomach

Pyloric sphincter

Duodenum

RugaePlicae circularis

PANCREAS AND SPLEEN MODELS

• Kidney• Gall bladder• Pancreas• spleen (function is to remove foreign antigens

and aging RBC’s) • duodenum• plicae circularis

Duodenum

Pancreas

Spleen

Plicae circularis

Spleen

Kidney

Pancreas

Duodenum

Gall bladder

Plicae circularis

GI MODEL• Stomach• Pancreas• Spleen• Pyloric sphincter • circular folds (known as plicae circularis; these are macroscopic folds in the

mucosa)• ascending colon• transverse colon• descending colon• tenia coli• Jejunum (middle part of small intestine)• Ileum• Cecum• Ileocecal valve• Appendix• Rectum•  NOTE: Plicae circularis, microvilli, and villi all increase the surface area of

the small intestinal lining

GI Model

Pancreas

Duodenum

Pyloric sphincter

Plicae circularis

Stomach

Spleen

Ascending colon

Descending colon

Transverse colon

Tenia coli

Jejunum

Rectum

Ileum

Cecum

Ileocecal valve

Appendix

Tenia coli

Rectum

Plicae circularis

INTESTINE MODEL• Stomach• Pancreas• Spleen• Pyloric sphincter • circular folds (known as plicae circularis; these are macroscopic folds in the

mucosa)• ascending colon• transverse colon• descending colon• tenia coli• Jejunum (middle part of small intestine)• Ileum• Cecum• Ileocecal valve• Appendix• Rectum•  NOTE: Plicae circularis, microvilli, and villi all increase the surface area of

the small intestinal lining

Greater OmentumTenia coli

Cecum

PancreasDuodenum

Jejunum

Transverse colon

Tenia coli

Mesentery

Pancreas

Common bile duct

Duodenum

Appendix

CecumSigmoid colon (first half)

Ascending colon

Descending colon

Other half of the Sigmoid colon

Liver Models

• gall bladder

• cystic duct

• common bile duct

• falciform ligament

LiverCYSTIC DUCT, GALL BLADDER

COMMON BILE DUCT (has been cut)

Falciform ligament

SLIDES

• Salivary gland

• Tongue– taste bud

• Small Intestine– Villi– Intestinal crypt

Salivary gland

Salivary gland

TongueTaste buds

SLIDES

• Small intestine – Villi, microvilli, and plicae circularis: (Serve to

increase the surface area of the small intestine)

– Intestinal crypts

Small Intestine

Villus

Intestinal crypt

SLIDES

• Liver: the functional unit of the liver is the lobule.– central vein

Liver Lobules

Liver Lobule

• Central vein

Liver

SLIDES

• Spleen: removes foreign antigens and aging RBC's– Red pulp– White pulp

• Pancreas– Islets– Acini

– Be able to tell the difference between liver, spleen, pancreas, and kidney slides!

Spleen

Spleen

Red Pulp

White pulp

PancreasIslet of Langerhans (secretes insulin)

Pancreas

Acinar cells (secrete enzymes)

Islet of Langerhans (secretes insulin)

Glomerulus

TubuleKidney

Pancreas Kidney

Spleen Liver

Red Pulp White pulp Central vein