1. Find the oral mucosa (mucous membrane) and the muscular structure of the tongue (formed by striated myofibers of the somatic type):
- the oral mucosa (mucous membrane):
- is made up of stratified squamous partially keratinized epithelium and lamina propria; the latter enters the epithelium via secondary papillae of the connective tissue and is fully connected with the muscular structure;
- contains foliate papillae (surrounded by a narrow lumen which admits excretory ducts of the salivary glands; the lateral epithelium areas of the papillae contain taste buds);
- the lamina propria and the muscular structure of the tongue has terminal regions and excretory ducts of the salivary glands.
2. Study the structure of the basic parts in the back of the tongue:
- the surface of the papilla is covered with partially keratinized epithelium, the lateral parts – with non-keratinized epithelium;
- find the taste buds in the lateral epithelium areas of the papillae; each bud opens up with a taste pore into the slit between the papillae;
- secretory parts of the salivary glands are presented by serous cells with basophilic cytoplasm and a circular-shaped nucleus placed in the center;
- next to the secretory parts of the salivary glands there are Intramural ganglia of the parasympathetic nervous system – are stations of larger basophilic nerve cells enclosed by glial cells - satellites.
3. Draw and sign:
1 - foliate papilla,
2 - stratified epithelium,
3 - taste buds,
4 - secondary papillae of the connective tissue,
5 - lamina propria,
6 - terminal regions of salivary glands,
7 - excretory duct of the salivary gland,
8 - striated myofibers,
9 - intramural ganglion.
4. Define and write significant features of the slide.