Periodontal Ligament Nerves Quiz
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Questions and Answers

What type of nerve fibers in the periodontal ligament regulate the luminal diameter of the arterioles?

  • Somatic fibers
  • Autonomic fibers (correct)
  • Proprioceptive fibers
  • Sensory fibers

Which type of nerve fibers in the periodontal ligament mediate pain sensation?

  • Sensory fibers (correct)
  • Sympathetic fibers
  • Proprioceptive fibers
  • Motor fibers

What reflex is initiated by proprioceptive fibers in the periodontal ligament, causing an involuntary opening of the jaw when biting down on something hard?

  • Knee-jerk reflex
  • Startle reflex
  • Jaw-jerk reflex (correct)
  • Blink reflex

Which type of collagenous connective tissue is found deep to the epithelium in the gingiva?

<p>Dense irregular collagenous connective tissue (D)</p> Signup and view all the answers

What is the principal fiber group in the gingiva that resembles those of the periodontal ligament?

<p>Type I collagen fibers (D)</p> Signup and view all the answers

How does the epithelium of the gingiva attach to the enamel surface near the tooth?

<p>By hemidesmosomes (A)</p> Signup and view all the answers

Which oral structure separates the oral cavity from the nasal cavity?

<p>Palate (D)</p> Signup and view all the answers

What type of epithelium covers the masticatory mucosa on the oral aspect of the hard palate?

<p>Stratified squamous keratinized epithelium (C)</p> Signup and view all the answers

Which epithelium covers the uvula in the oral cavity?

<p>Stratified squamous nonkeratinized epithelium (B)</p> Signup and view all the answers

What is responsible for the movement of the uvula?

<p>Skeletal muscle (C)</p> Signup and view all the answers

Which oral structure forms a robust barrier between the oral cavity and the gingival connective tissue?

<p>Junctional epithelium (A)</p> Signup and view all the answers

What type of tissue underlies the wet stratified squamous keratinized epithelium on the oral aspect of the hard palate?

<p>Dense irregular collagenous connective tissue (B)</p> Signup and view all the answers

What do odontoblasts manufacture during dentinogenesis?

<p>Dentin (B)</p> Signup and view all the answers

Why does dentin have the capability of self-repair?

<p>As a result of odontoblasts remaining functional (C)</p> Signup and view all the answers

What is thought to mediate dentin sensitivity?

<p>Sensory nerve fibers (D)</p> Signup and view all the answers

What causes the depolarization of nerve fibers associated with dentin sensitivity?

<p>Disturbance of tissue fluid within dentinal tubules (D)</p> Signup and view all the answers

What is the composition of cementum?

<p>Mainly organic matrix with some calcium hydroxyapatite (A)</p> Signup and view all the answers

What do odontoblasts have a close association with in the context of dentin sensitivity?

<p>Sensory nerve fibers (A)</p> Signup and view all the answers

What is the main function of the odontoblastic zone of the pulp?

<p>Formation of dentin (B)</p> Signup and view all the answers

Which zone of the pulp lacks cells and is located deep to the odontoblastic zone?

<p>Cell-free zone (D)</p> Signup and view all the answers

What is a characteristic feature of the cell-rich zone of the pulp?

<p>Consists of fibroblasts and mesenchymal cells (A)</p> Signup and view all the answers

What distinguishes the pulp core from most other loose connective tissues?

<p>Presence of adipose cells (D)</p> Signup and view all the answers

Which type of nerve fibers in the pulp are responsible for controlling blood vessel diameters?

<p>Sympathetic fibers (B)</p> Signup and view all the answers

What clinical observation indicates hemorrhage of the pulp?

<p>Black discoloration of the tooth (A)</p> Signup and view all the answers

What is the average lifespan of cells in the taste buds?

<p>10 days (C)</p> Signup and view all the answers

Which type of cells in the taste bud function as reserve cells and regenerate other cells?

<p>Basal cells (type IV cells) (B)</p> Signup and view all the answers

Where do nerve fibers enter the taste bud to form synaptic junctions with specific cell types?

<p>Taste pore (B)</p> Signup and view all the answers

What are the spindle-shaped cells in a taste bud composed of?

<p>60-80 cells (B)</p> Signup and view all the answers

Which epithelial cells form the taste pore that interacts with nerve fibers?

<p>Squamous epithelial cells (A)</p> Signup and view all the answers

What is the main function of the long, slender microvilli that protrude from the taste pore?

<p>Taste sensation discernment (C)</p> Signup and view all the answers

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