Page 514 - Atlas of Histology with Functional Correlations

FIGURE 13.8 | Tongue: Filiform and Fungiform

Papillae

This low-power photomicrograph shows the dorsal surface of the tongue with a
large fungiform papilla (2). The surface of this papilla (2) is covered by

stratified squamous epithelium (3) that is not cornified or keratinized. The
fungiform papilla (2) also exhibits numerous taste buds (4) located in the
epithelium on the apical surface of the papilla, in contrast to the circumvallate
papillae, in which the taste buds are located in the peripheral epithelium (see Fig.

13.7).

The underlying lamina propria (5) projects into the surface epithelium of
the fungiform papilla (2) to form numerous indentations. Surrounding the
fungiform papilla (2) are the slender filiform papillae (1), whose conical tips are

covered by stratified squamous epithelium that exhibits partial keratinization.

FIGURE 13.8 ■ Tongue: filiform and fungiform papillae. Stain: hematoxylin
and eosin. ×25.

FIGURE 13.9 | Tongue: Taste Buds

The taste buds (5, 12) at the bottom of a furrow (14) of the circumvallate papilla

are illustrated in greater detail. The taste buds (5, 12) are embedded within and
extend the full thickness of the stratified lingual epithelium (1). The taste buds
(5, 12) are distinguished from the surrounding stratified epithelium (1) by their
oval shapes and elongated cells (modified columnar) that are arranged
perpendicular to the epithelium (1).

513