Tongue-Longitudinal Section
Tongue - Fungiform and Filiform Papillae
• Tongue is a muscular organ.
• Dorsal surface of tongue is lined by stratified squamous epithelium overlying the dense lamina propria with blood vessels, nerves and lingual glands.
• Surface is rough because of papillary projections.
There are three types of papillae--filiform, fungiform and circumvallate papillae.
surround the papillae, walls of which contain the taste buds. Bottom of the sulcus has the opening of serous glands.
Circumvallate papillae are only 8-12 in number and are situated in front of sulcus terminalis. They are large in size with base narrower than the apex. A circular sulcus
• Filiform are present in most of the area of dorsal surface, conical in shape. No taste buds. Mucosa covering these papillae are keratinized-makes the tongue surface
• Fungiform papillae are scattered and round in shape with taste buds at the apical surface.
•Taste buds are modified epithelial cells which are in contact with the nerves carry taste sensation. Tongue is richly innervated, taste is a special sensation.
Lip
• Skin-thin layered, made up of:
Epidermis stratified squamous keratinized epithelium with hair follicle and sebaceous glands.
Dermis contains non-hair follicle associated sebaceous glands and sweat glands.
• Mucosa thick layered, lined by stratified squamous non-keratinized epithelium with prominent rete ridges.
• Beneath the mucosa, mucous secreting labial glands seen which helps to keep it moist.