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

What is the necessary condition for axons to regenerate?

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

What is the primary constraint on axon regeneration?

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

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

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

What would prevent axon regeneration from occurring?

<p>Neuronal cell body is damaged (B)</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 (B)</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 (D)</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 (A)</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 (B)</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 (B)</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 (A)</p> Signup and view all the answers

What is the primary target of injury in axonal neuropathies?

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

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

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

What is a characteristic feature of axonal neuropathies?

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

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

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

What is the underlying mechanism of axonal neuropathies?

<p>Direct axonal injury (A)</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 (A)</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 (B)</p> Signup and view all the answers

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

<p>Nervous system (D)</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 (B)</p> Signup and view all the answers

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

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

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