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Questions and Answers
The mucosa of the tongue is composed of three parts.
The mucosa of the tongue is composed of three parts.
False
Filiform papillae are mushroom-shaped and contain taste buds.
Filiform papillae are mushroom-shaped and contain taste buds.
False
Fungiform papillae are found at the tip and lateral sides of the tongue.
Fungiform papillae are found at the tip and lateral sides of the tongue.
True
Circumvallate papillae are found at the tip of the tongue.
Circumvallate papillae are found at the tip of the tongue.
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The epithelium of fungiform papillae is keratinized.
The epithelium of fungiform papillae is keratinized.
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The ducts of serous minor salivary glands open into the trench surrounding the circumvallate papillae.
The ducts of serous minor salivary glands open into the trench surrounding the circumvallate papillae.
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Taste buds are found on the superior surface of circumvallate papillae.
Taste buds are found on the superior surface of circumvallate papillae.
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The core of filiform papillae is made of epithelium.
The core of filiform papillae is made of epithelium.
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The mucosa of the tongue is covered by masticatory mucosa (non-keratinized).
The mucosa of the tongue is covered by masticatory mucosa (non-keratinized).
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The lamina propria of fungiform papillae has many secondary papillae.
The lamina propria of fungiform papillae has many secondary papillae.
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Study Notes
Oral Mucosa
- Definition: The oral mucosa is the moist lining of the oral cavity.
Functions of Oral Mucosa
- Protection: protects deeper tissues from mechanical forces and abrasive nature of foodstuffs, and acts as a barrier against oral microorganisms.
- Sensation: responds to temperature, touch, pain, and taste, with some receptors responding to thirst.
- Secretion: produces saliva to maintain a moist surface, assist in mastication, swallowing, and speech.
Development of Oral Mucosa
- Composed of two layers: oral epithelium (derived from ectoderm) and lamina propria (derived from ectomesenchymal cells).
- The two layers are firmly cemented together by the basement membrane.
Histological Structure of Oral Mucosa
- Oral epithelium: stratified squamous epithelium composed of keratinocytes and non-keratinocytes.
- Lamina propria: connective tissue supporting the oral epithelium.
Types of Oral Epithelium
- Keratinized oral epithelium: found in areas subjected to mechanical forces of mastication (e.g., gingiva and hard palate).
- Parakeratinized oral epithelium: found in gingival mucosa, with pyknotic nuclei in the keratinous layer.
- Non-keratinized oral epithelium: found in lining mucosa of the oral cavity (e.g., lips, cheeks, alveolar mucosa, soft palate, and floor of the mouth).
Non-Keratinocytes
- Present at various levels in the oral epithelium (about 10% of epithelial cells).
- Types: pigment cells (melanocytes), Langerhans' cells, Merkel cells, and defensive cells (inflammatory cells).
Junction of Epithelium and Lamina Propria
- Basement membrane: anchors epithelium to connective tissue, acts as a mechanical barrier against malignant cells, and accelerates differentiation of endothelial cells.
- Composed of basal lamina: lamina lucida (clear zone) and lamina densa (dark zone).
Classification of Oral Mucosa
- Masticatory mucosa (keratinized mucosa): found in areas subjected to mechanical forces of mastication.
- Lining mucosa (non-keratinized mucosa): found in areas not subjected to mechanical forces.
- Specialized mucosa: found on the dorsal surface of the tongue, containing different types of lingual papillae.
Specialized Mucosa
- Location: dorsal surface of the tongue.
- Covered by masticatory mucosa (keratinized).
- Containing different types of lingual papillae, some of which bear taste buds.
Tongue Papillae
- Filiform papillae: thread-shaped, most numerous, and found in lines parallel to sulcus terminalis.
- Fungiform papillae: mushroom-shaped, less numerous, and found at the tip and lateral sides of the tongue.
- Circumvallate papillae: V-shaped row along the sulcus terminalis, larger than other papillae, and containing numerous taste buds.
Mucocutaneous Junction
- Vermilion border of the lip: the junction of the oral mucosa and skin.
Age Changes of Oral Mucosa
- Not discussed in the provided text.
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Description
This quiz covers the oral mucosa, including its functions, development, histological structure, and types of oral epithelium. It's designed for dental students at Al-Alamein International University's Faculty of Dentistry.
