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Digestive system (I)
Scheme to show the layers of the gut
1.Tongue No.23 (LP1. 2 ; Papillae ; Taste buds ; Vallate papilla)
2.Esophagus No.21 (LP 1 . 2. 3、HP )
3. Stomach NO.22 (LP、Mucosa 1 . 2. 3、Gastric glands )
4. Submandibular glands No.32 (LP 1. 2、HP1 . 2 )
Draw picture : Mucosa of stomach
E.M : Demonstration :
1、Parietal cells 1. Cardiac glands 2. Pyloric glands
2、Chief cells 3. Parotid glands( 1 . 2)
4. Sublingual glands( 1 . 2)
Tongue No.23
Tongue No.23
LP: Mucosa is covered by the surface stratified squamous epithelium. Connective tissue
extends up into each papilla. The most numerous papillae are small and conical in shape. they
are called filiform papillae. The epithelium at the tip of these papillae is keratinized and lacking
taste buds. The larger papillae with rounded summits an rrower bases. these are called
fungiform papillae. The epithelium is not keratinized and possess taste buds.
Papillae
Taste buds
1.Elongated cells
2.Pore
3.Stratified squamous epithelium
Each taste bud is a
piriform structure
made up of modified
epithelial cells. It
extends through the
entire thickness of
the epithelium. The
cells present in taste
buds are elongated
and are vertically
orientated.
Vallate papilla
1.Groove around
papilla
2.Taste bud
3.Serous glands
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