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Myelination and Myelin Sheath Formation
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Myelination and Myelin Sheath Formation

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Questions and Answers

What is the process by which the axon is enveloped in concentric layers of Schwann cell plasma membrane?

  • Myelination (correct)
  • Electrolysis
  • Osmosis
  • Neurotransmission
  • What is the term for the single axon enveloped by many layers of fused Schwann cell plasma membrane?

  • Mesaxon
  • Myelin Sheath (correct)
  • Node of Ranvier
  • Internode
  • What is the structure that forms as a result of the rotation of the mesaxon around the axon?

  • Node of Ranvier
  • Myelin Sheath (correct)
  • Schwann Cell
  • Axon
  • What is the term for the region of the axon that is not enveloped by the myelin sheath?

    <p>Node of Ranvier</p> Signup and view all the answers

    What is the term for the many layers of fused Schwann cell plasma membrane that envelop the axon?

    <p>Myelin Sheath</p> Signup and view all the answers

    What is the necessary condition for axons to regenerate?

    <p>The neuronal cell body is not damaged</p> Signup and view all the answers

    What is the primary constraint on axon regeneration?

    <p>The health of the neuronal cell body</p> Signup and view all the answers

    What is the term for the segment of myelin produced by each Schwann cell?

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

    What would prevent axon regeneration from occurring?

    <p>Neuronal cell body is damaged</p> Signup and view all the answers

    What is the function of the myelin sheath in the context of the axon?

    <p>To facilitate the transmission of signals along the axon</p> Signup and view all the answers

    What is the relationship between the neuronal cell body and axon regeneration?

    <p>The neuronal cell body is essential for axon regeneration</p> Signup and view all the answers

    What is the implication of axon regeneration being dependent on the neuronal cell body?

    <p>Axon regeneration is limited by cell body integrity</p> Signup and view all the answers

    What are the nodes of Ranvier?

    <p>Segments of the axon that are not covered by the myelin sheath</p> Signup and view all the answers

    What is the relationship between the internode and the nodes of Ranvier?

    <p>The internode is the gap between two nodes of Ranvier</p> Signup and view all the answers

    What is the role of the Schwann cells in the context of the axon?

    <p>To produce the myelin sheath that ensheathes the axon</p> Signup and view all the answers

    What is the primary target of injury in axonal neuropathies?

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

    Which type of neuropathy is most likely caused by direct axonal injury?

    <p>Axonal neuropathy</p> Signup and view all the answers

    What is a characteristic feature of axonal neuropathies?

    <p>Axonal degeneration</p> Signup and view all the answers

    In axonal neuropathies, which structure is most likely to be spared?

    <p>Myelin sheath</p> Signup and view all the answers

    What is the underlying mechanism of axonal neuropathies?

    <p>Direct axonal injury</p> Signup and view all the answers

    What is the primary symptom of the condition described?

    <p>Rapidly progressive weakness of limbs and respiratory muscles</p> Signup and view all the answers

    What is the most likely impact of the condition on the patient's daily life?

    <p>Impaired mobility and respiratory function</p> Signup and view all the answers

    Which of the following systems is most affected by the condition?

    <p>Nervous system</p> Signup and view all the answers

    What is the likely outcome if the condition is left untreated?

    <p>Progressive decline in muscle function and eventual respiratory failure</p> Signup and view all the answers

    Which of the following is a possible complication of the condition?

    <p>Respiratory failure</p> Signup and view all the answers

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