Page 538 - Atlas of Histology with Functional Correlations

buds

Fungiform papillae are less numerous, larger, mushroom-like, and contain
taste buds
Circumvallate papillae are largest, are in the back of the tongue, and are
encircled by furrows
Numerous taste buds located on the lateral sides of each papilla

Underlying serous glands empty serous secretions into the base of furrows
Foliate papillae are rudimentary in humans
Posterior lingual glands in the connective tissue open onto dorsal surface of

tongue

Taste Buds

Located in foliate, fungiform, and circumvallate papillae; pharynx; palate;

and epiglottis
Exhibit tastes pores and occupy thickness of epithelium; microvilli protrude
through taste pore
Neuroepithelial cells synapse with afferent axons and are the receptors for
taste

Also contain supportive sustentacular cells, whereas basal cells can serve as
stem cells
Substances that are tasted are first dissolved in saliva and then enter taste

pore
Serous glands wash peripheral taste buds in the furrows of circumvallate
papillae
Five basic taste sensations are sour, salt, bitter, sweet, and umami
Sensitivity to all tastes distributes across entire tongue

Some areas of tongue may be more sensitive to certain tastes

Lymphoid Aggregations: Tonsils

Diffuse lymphoid tissue and nodules in the oral pharynx

Palatine and lingual tonsils covered by stratified squamous epithelium and
show crypts
Pharyngeal tonsil is single and covered by pseudostratified ciliated

epithelium
Some lymphatic nodules contain germinal centers

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