Dorsal surface of the tongue; no papillae are visible.
The clefts in this specimen are due to shrinkage during critical-point drying.

gr, groove.

SEM. Scale bar = 1000 µm.

Fig. 2. Platemys pallidipectoris.

Dorsal surface of the tongue; dome-shaped bulges correspond to single cells.

cb, cell borders; mv, microvilli.

SEM. Scale bar = 1 µm.

The epithelium is stratified and contains cells of the squamous and/or cuboidal type; the underlying connective tissue is distinct. The arrow indicates a taste bud.

ct, connective tissue; ep, epithelium; oc, oral cavity.

LM. Scale bar = 100 µm.

Postfixation with osmium tetroxide/K-ferricyanide. The perikaryal cytoplasm around the nucleus of a surface layer cell contains a Golgi complex and numerous mitochondria; microvilli on the free-surface side are short.

g, secretory granula; gc, Golgi complex; m, mitochondria; s, nucleus.

TEM. Scale bar = 5 µm.