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Questions and Answers
What type of epithelium lines the oral cavity?
What type of epithelium lines the oral cavity?
Which region of the mouth is lined with keratinized stratified squamous epithelium?
Which region of the mouth is lined with keratinized stratified squamous epithelium?
What is the composition of the soft palate?
What is the composition of the soft palate?
Which part of the oral cavity has a very thin keratinized layer?
Which part of the oral cavity has a very thin keratinized layer?
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What type of glands are located in the corium of the lip's internal surface?
What type of glands are located in the corium of the lip's internal surface?
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Which type of papillae is NOT mentioned as a lingual papilla?
Which type of papillae is NOT mentioned as a lingual papilla?
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What type of connective tissue is present in the corium of the lip?
What type of connective tissue is present in the corium of the lip?
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What is the primary function of the oral cavity?
What is the primary function of the oral cavity?
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What embryonic failure leads to cleft lip and cleft palate?
What embryonic failure leads to cleft lip and cleft palate?
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What condition is characterized by small white bumps and patches on the tongue and results from a fungal infection?
What condition is characterized by small white bumps and patches on the tongue and results from a fungal infection?
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Which bacterium is commonly associated with pharyngitis and tonsillitis?
Which bacterium is commonly associated with pharyngitis and tonsillitis?
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What type of epithelium mostly lines the internal aspect of the lip?
What type of epithelium mostly lines the internal aspect of the lip?
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What is black hairy tongue primarily associated with?
What is black hairy tongue primarily associated with?
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A patient presents with shallow ulcers in the mouth. What is the likely diagnosis?
A patient presents with shallow ulcers in the mouth. What is the likely diagnosis?
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Which condition results in a swollen and inflamed tongue and can be caused by various factors?
Which condition results in a swollen and inflamed tongue and can be caused by various factors?
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What is the primary underlying cause of oral thrush in neonates?
What is the primary underlying cause of oral thrush in neonates?
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What is the primary reason for the pinkish red color of the lip's red margin?
What is the primary reason for the pinkish red color of the lip's red margin?
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Which type of epithelium covers the surface of the tongue?
Which type of epithelium covers the surface of the tongue?
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What distinguishes fungiform papillae from other types on the tongue?
What distinguishes fungiform papillae from other types on the tongue?
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Which characteristic is unique to circumvallate papillae?
Which characteristic is unique to circumvallate papillae?
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What type of connective tissue comprises the core of a filiform papilla?
What type of connective tissue comprises the core of a filiform papilla?
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Which statement about the ventral surface of the tongue is accurate?
Which statement about the ventral surface of the tongue is accurate?
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Why are lips particularly sensitive?
Why are lips particularly sensitive?
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Which type of papillae has no taste buds and covers the anterior 2/3 of the tongue?
Which type of papillae has no taste buds and covers the anterior 2/3 of the tongue?
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What distinguishes foliate papillae from other types of lingual papillae?
What distinguishes foliate papillae from other types of lingual papillae?
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Where are von-Ebner's glands located?
Where are von-Ebner's glands located?
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Which taste sensation is primarily detected at the sides of the tongue?
Which taste sensation is primarily detected at the sides of the tongue?
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What type of cells serve as the stem cells in the structure of taste buds?
What type of cells serve as the stem cells in the structure of taste buds?
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Which of the following statements about the mechanism of taste sensation is true?
Which of the following statements about the mechanism of taste sensation is true?
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Which type of cancer is most commonly associated with the oral cavity?
Which type of cancer is most commonly associated with the oral cavity?
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What type of taste bud cells project through the gustatory pore?
What type of taste bud cells project through the gustatory pore?
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Cleft palate is classified as what type of condition?
Cleft palate is classified as what type of condition?
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Study Notes
Oral Cavity Histology
- Oral cavity lining is primarily non-keratinized stratified squamous epithelium, with exceptions:
- Hard palate and gingiva: Keratinized stratified squamous
- Dorsum of tongue: Partially keratinized stratified squamous
- Red margin of lip: Stratified squamous with very thin keratin
Lip Structure
- Skeletal muscle core: Arranged in various directions
- Outer surface: Thin skin composed of epidermis and dermis containing hair follicles, sweat, and sebaceous glands
- Inner surface: Mucous membrane with non-keratinized stratified squamous epithelium and loose connective tissue (corium) containing muco-serous labial glands
Red Margin of the Lip
- Transitional zone: Between skin and mucous membrane
- Modified skin: With thin keratin, no hair follicles, sweat, or sebaceous glands
- Deep dermal papillae: Containing numerous blood capillaries, responsible for the pinkish red color of the lip
- Rich in nerve endings: Contributing to the lip's high sensitivity
Tongue Structure
- Muscular organ: Composed of striated muscle fibers arranged longitudinally, horizontally, and vertically
- Mucous membrane: Consists of a connective tissue corium (lamina propria) strongly attached to the muscle and covered by stratified squamous epithelium
- Dorsal surface: Rough due to lingual papillae, divided into an anterior 2/3 and a posterior 1/3 by a V-shaped depression (sulcus terminalis)
- Ventral surface: Smooth
Lingual Papillae
- Projections of mucous membrane: Located on the anterior 2/3 of the tongue's dorsum
- Central core: Connective tissue, covered by stratified squamous epithelium (some keratinized, some non)
- Four types: Conical (filiform), fungiform, circumvallate, foliate
Conical (Filiform) Papillae
- Numerous: Highly keratinized, conical in shape with no taste buds
- Location: Cover the anterior 2/3 of the tongue's dorsum
Fungiform Papillae
- Scattered: Between the conical papillae, especially on the tongue's margin
- Rounded: With a basal constriction
- Highly vascular connective tissue core:
- Few taste buds:
Circumvallate Papillae
- Location: Along the V-shaped line on the tongue's dorsum, at the junction between the anterior 2/3 and posterior 1/3
- Large and rounded: With constricted bases
- Numerous taste buds:
- Serous Von Ebner’s glands: Accessory salivary glands
- Ducts open into trenches: Surrounding the circumvallate papillae
Foliate Papillae
- Parallel ridges: Separated by deep grooves of connective tissue covered by stratified squamous epithelium
- Many taste buds:
- Function: Facilitate licking of milk and watery materials
- Location: Posterior part of the tongue
- Well-developed in animals: Like rabbits, rudimentary in humans
Taste Sensations
- Regional detection: Taste may be detected regionally without significant structural differences in taste buds
- Sweet and Salty: Detected at the tip of the tongue
- Sour (Acids): Detected at the sides of the tongue
- Bitter: Detected in circumvallate papillae
Glands of the Tongue
- Von-Ebner's glands: Serous glands found beneath the circumvallate papillae
- Mucous glands: Present in the corium of the posterior part of the tongue
Lingual Tonsils
- Masses of lymphoid tissue: Found in the mucous membrane of the posterior 1/3 of the tongue's dorsum
Taste Buds
- Neuroepithelial: Pale, oval, flask-shaped bodies concerned with taste sensation
- Location: Found in the papillae of the tongue (fungiform, circumvallate, and foliate), soft palate, pharynx, and epiglottis
- Open on surface via gustatory pores:
Structure of Taste Buds
- Gustatory or hair (taste) cells: Long cells with microvilli projecting through the gustatory pore. Their basal parts have numerous vesicles and are surrounded by fine (non-myelinated) sensory nerve fibers.
- Sustentacular cells: Supporting function, have long microvilli and lightly stained nuclei. They can be of two types.
- Basal cells: Short, present at the base, act as stem cells for the previous types.
Mechanism of Taste Sensation
- Substance dissolved in saliva: Passes through gustatory pores, affects the microvilli of hair cells, initiating a nerve impulse that is transmitted to the brain.
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Description
Test your knowledge on the histological structure of the oral cavity, including the types of epithelium found in different regions. Explore the specific anatomical features of the lips and their unique characteristics. Perfect for students and professionals in dentistry and anatomy.
