Digestive System

DIGESTIVE SYSTEM I
The Oral Cavity
Dr. Paul W. L. Kwan
Tufts University School of Medicine
learnedness Objectives
1. The general architecture of the digestive tract is that of a veritable(prenominal) hollow tube.
2. Understand the histology of each of the layers: mucosa, submucosa, muscularis
externa and the serosa.
3. The main components of the dialect ar the mucosa and the muscular core.
4. The dorsal surface of the tongue has lingual papillae. Know which type of the
papillae contains taste buds and which type does not.
5. The skeletal muscles of tongue are arranged in three axes.
6. Understand the differences amongst brachydont and hypsodont teeth.
7. Know the composition of enamel, dentin, cementum and the cells that produce
them.
8. The dental pulp contains capillaries, nerves, lymphatics and undefended connective
tissue.
9. Salivary glands can be of the serous, mucous or the tangled seromucous type.
10. The secretory portion of the salivary gland contains both secretory cells and
myoepithelial cells.
11. The ducts of the salivary glands contain epithelial and myoepithelial cells.
12. Understand the composition of the secretion from the salivary glands.
There is quite a bit of differences in the digestive systems of various species. The
requirements differ considerably between the herbivores, carnivores and the omnivores.




Species that are monogastric (with a single, true stomach) are quite different from the
ruminants (with fermentative rumen).
present we will present the general anatomy and function of the GI tract and will mention
specific important differences where applicable.
Basic Functions of the digestive Tract
The digestive tract has the following functions:
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Prehension (grasping) of food with the lips and mouth
mechanically skillful breaking down of the food by chewing
Digestion of foodstuff by enzymatic and chemical reactions
Absorption of nutrients and water
Elimination of wastes

Veterinary Histology

1

digestive I

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