Title: Scheme taste bud of the tongue
Scheme electron microscopy, human.
Generally a taste bud is composed of about 20 to 70 spindle-shaped epithelial cells.
Slender type I cell (‘Dark’ cell) and oval shaped type II cell (‘Light’ cell) with a pale, round nucleus with their apices end in microvilli in the taste pore.
The number of type I cells is about twice of that of type II cells. A type III cell without microvilli is in the minority. Synapse-like relations of above-mentioned cells with intraepithelial nerves are reported.
Keywords/Mesh: oral cavity, mouth, tongue, foliate papilla, taste bud, taste pore, von Ebner, exocrine gland, histology, electron microscopy, POJA collection
Title: Schemes of foliate papillae of the tongue (B) and of taste bud in foliate papilla (C)
2. non-keratinized stratified squamous epithelium
3. taste bud
4. serous gland (von Ebner)
5. draining duct (of serous gland)
7. foliate papilla
8. light cell (type II) with pale nucleus
9. dark cell (type I) with slender dark nucleus
10. (efferent) nerve fibers
11. lamina propria
12. taste pore
Title: Foliate papillae of the tongue (dorsal side)
Stain Trichrome-Goldner, rabbit. Foliate papil with primary and secondary connective tissue projections. Taste buds are localized in the lining, non-keratinized epithelium of the grooves. The serous gland of von Ebner (minor salivary gland) drains via an enlarged duct into the left groove of the papil.
Title: Taste buds of foliate papillae
Stain Heidenhain’s iron hematein, rabbit. Taste buds within the lining (non-keratinized) epithelium of the groove.
Note the pore in the left taste bud, with darkly stained fluffy apical microvilli. The lightly stained gustatory nerve fibers (nuclei of Schwann cells) approach the left taste buds.
Title: Taste bud of a foliate papil
Stain Heidenhain’s iron hematein. Taste bud with slender cells and darker stained spiky nuclei (type I cell), and cells with light stained round nuclei (type II cells).
Below axons of the gustatory nerve fibers and nuclei of Schwann cells. Arrow points to narrow pore where dark stained fluffy structures represent apical microvilli.