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1. Musculo-epithelial cells
2. Enteron (gastrovascular cavity)
3. Mesogleal plate
4. Epidermis
5. Gastrodermis
6. Cnidoblasts
(precursors of nematocysts)
7. Interstitial cells
8. Pedal Disc
9. Gland cells
10. Hollow tentacle
11. Position of mouth
12. Hypostome
13. Nutritive-muscular cell
14. Enzyme-secreting cell
15. Mucus-secreting cell
16. Column
17. Food vacuoles
18. Transverse muscle
19. Stalk Cells
20. Cells not engaged in digestion
or absorption
Gastrodermis Region
Hypostome
Region
Column
Region
Stalk
Region
10
12
11
1
2
3
4
5
6
7
8
9
19
16
Hypostome
Column
Stalk
20
17
18
18
13
14
15
Hydra,
Longitudinal Section
