Oral Cavity Histology Quiz
32 Questions
1 Views

Oral Cavity Histology Quiz

Created by
@GenialBlue

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What type of epithelium lines the oral cavity?

  • Keratinized stratified columnar epithelium
  • Simple cuboidal epithelium
  • Pseudostratified ciliated columnar epithelium
  • Non-keratinized stratified squamous epithelium (correct)

    • Which region of the mouth is lined with keratinized stratified squamous epithelium?

  • Dorsum of the tongue
  • Soft palate
  • Red margin of the lip
  • Hard palate (correct)

    • What is the composition of the soft palate?

  • Bone and fibrocartilage
  • Striated muscle and mucous glands (correct)
  • Adipose tissue and nerve fibers
  • Smooth muscle and connective tissue

    • Which part of the oral cavity has a very thin keratinized layer?

    <p>Red margin of lip</p> Signup and view all the answers

    What type of glands are located in the corium of the lip's internal surface?

    <p>Muco-serous glands</p> Signup and view all the answers

    Which type of papillae is NOT mentioned as a lingual papilla?

    <p>Foliate papillae</p> Signup and view all the answers

    What type of connective tissue is present in the corium of the lip?

    <p>Loose connective tissue</p> Signup and view all the answers

    What is the primary function of the oral cavity?

    <p>Transport of food with minimal metabolic activity</p> Signup and view all the answers

    What embryonic failure leads to cleft lip and cleft palate?

    <p>Failure of fusion of palatal plates</p> Signup and view all the answers

    What condition is characterized by small white bumps and patches on the tongue and results from a fungal infection?

    <p>Oral thrush</p> Signup and view all the answers

    Which bacterium is commonly associated with pharyngitis and tonsillitis?

    <p>Streptococcus pyogenes</p> Signup and view all the answers

    What type of epithelium mostly lines the internal aspect of the lip?

    <p>Nonkeratinized stratified squamous</p> Signup and view all the answers

    What is black hairy tongue primarily associated with?

    <p>Poor oral hygiene</p> Signup and view all the answers

    A patient presents with shallow ulcers in the mouth. What is the likely diagnosis?

    <p>Aphthous stomatitis</p> Signup and view all the answers

    Which condition results in a swollen and inflamed tongue and can be caused by various factors?

    <p>Glossitis</p> Signup and view all the answers

    What is the primary underlying cause of oral thrush in neonates?

    <p>Immature immune system</p> Signup and view all the answers

    What is the primary reason for the pinkish red color of the lip's red margin?

    <p>Deep dermal papillae containing blood capillaries</p> Signup and view all the answers

    Which type of epithelium covers the surface of the tongue?

    <p>Stratified squamous epithelium</p> Signup and view all the answers

    What distinguishes fungiform papillae from other types on the tongue?

    <p>They are predominantly located on the anterior 2/3 of the tongue</p> Signup and view all the answers

    Which characteristic is unique to circumvallate papillae?

    <p>Located at the junction of the anterior 2/3 and posterior 1/3 of the tongue</p> Signup and view all the answers

    What type of connective tissue comprises the core of a filiform papilla?

    <p>Loose areolar connective tissue</p> Signup and view all the answers

    Which statement about the ventral surface of the tongue is accurate?

    <p>It is smooth and free from papillae</p> Signup and view all the answers

    Why are lips particularly sensitive?

    <p>Rich supply of nerve endings</p> Signup and view all the answers

    Which type of papillae has no taste buds and covers the anterior 2/3 of the tongue?

    <p>Conical (Filiform)</p> Signup and view all the answers

    What distinguishes foliate papillae from other types of lingual papillae?

    <p>They are formed of parallel ridges and have many taste buds.</p> Signup and view all the answers

    Where are von-Ebner's glands located?

    <p>Underneath the circumvallate papillae.</p> Signup and view all the answers

    Which taste sensation is primarily detected at the sides of the tongue?

    <p>Sour.</p> Signup and view all the answers

    What type of cells serve as the stem cells in the structure of taste buds?

    <p>Basal cells.</p> Signup and view all the answers

    Which of the following statements about the mechanism of taste sensation is true?

    <p>Substances must dissolve in saliva to initiate a nerve impulse.</p> Signup and view all the answers

    Which type of cancer is most commonly associated with the oral cavity?

    <p>Squamous cell carcinoma.</p> Signup and view all the answers

    What type of taste bud cells project through the gustatory pore?

    <p>Gustatory or hair cells.</p> Signup and view all the answers

    Cleft palate is classified as what type of condition?

    <p>Common birth defect.</p> Signup and view all the answers

    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.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Related Documents

    Histology of the Oral Cavity, Lip & Tongue PDF

    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.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser