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
