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Questions and Answers
What type of epithelium is present in the masticatory mucosa?
Which cell type is responsible for melanin production in the oral mucosa?
What is the function of Langerhans cells in the oral mucosa?
Which region of the oral mucosa allows for stretching due to its loose attachment?
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What is the unique characteristic of the mucosa that attaches to the tooth?
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Which term refers to the fluid that oozes through the lining into the crevice around the tooth?
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What is the primary function of the mucosa of the dorsum of the tongue?
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Which of the following statements about salivary glands is incorrect?
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What is the primary function of the lymphatic system?
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Which of the following statements about the structure of salivary glands is correct?
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Which of the following statements about lymph nodes is incorrect?
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What is the primary function of the tonsils?
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Study Notes
Oral Mucosa
- The oral mucosa is continuous with the skin of the lip at the vermilion zone and the pharyngeal mucosa posteriorly.
- The mucosa is attached to the underlying bone or muscle by a loose connective tissue called submucosa.
- The mucosa is firmly attached to the periosteum of the hard palate and to the alveolar process (gingiva) in the masticatory mucosa.
- The mucosa is loosely attached in the lining mucosa, allowing it to stretch.
- The stratified squamous epithelium varies in thickness and is either keratinized or nonkeratinized.
Masticatory Mucosa
- The mucosa in the hard palate and gingiva is referred to as masticatory mucosa due to its functional adaptation to mastication.
- The mucosa is firmly attached to the periosteum of the hard palate and to the alveolar process (gingiva).
- The stratified squamous epithelium is keratinized in the masticatory mucosa.
Lining Mucosa
- The mucosa in regions other than the hard palate and gingiva is referred to as lining mucosa.
- The mucosa is loosely attached, allowing it to stretch.
- The stratified squamous epithelium is nonkeratinized in the lining mucosa.
Specialized Mucosa
- The mucosa of the dorsum of the tongue is called specialized mucosa due to the presence of taste buds in papillae.
Salivary Glands
- The major salivary glands (parotid, submandibular, and sublingual) and minor salivary glands secrete salivary secretion into the oral cavity.
- The glands are divided into compartments called lobes and lobules by connective tissue containing nerves, blood vessels, and lymphatics.
- The acini are the production centers of salivary secretion and are of two types: serous and mucous acini.
- The ducts modify the salivary secretion with regard to quantity and electrolytes.
Lymphoid Tissue and Lymphatics
- The tissue fluid contains diffusible constituents of blood and waste products discarded by cells.
- About 1/10th of the tissue fluid is carried by lymphatic vessels and passes through lymph nodes.
- The lymph nodes filter foreign substances called antigens and contain different zones with mature lymphocytes (B and T lymphocytes).
- The lymphatic system consists of primary lymphoid organs (thymus and bone marrow) and secondary lymphoid organs (spleen and lymph nodes).
- Enlargements of lymph nodes are of clinical significance and occur as a response to an invading organism or tumor cells.
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Description
Test your knowledge on the anatomy of the oral mucosa, including its structure, attachments, and continuity with other parts of the gastrointestinal tract.
