Question

The myelin sheath around the axon is formed by:

  • Option 1: Nodes of Ranvier
  • Option 2: Synaptic knob
  • Option 3: Schwann cells
  • Option 4: Both b and c

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Answer

Question: The myelin sheath around the axon is formed by:

  • Option 1: Nodes of Ranvier
  • Option 2: Synaptic knob
  • Option 3: Schwann cells
  • Option 4: Both b and c

:

The correct option is Option 3: Schwann cells.

Schwann cells are essential for forming the myelin sheath around the axon. They are found in both myelinated and unmyelinated nerve fibers; however, they specifically create the myelin sheath in myelinated nerve fibers.

The Nodes of Ranvier are the gaps between sections of the myelin sheath because the sheath is not continuous. On the other hand, synaptic knobs are bulb-like structures located at the distal ends of the axon branches. These knobs contain synaptic vesicles filled with neurotransmitters. As a result, neither the Nodes of Ranvier nor the synaptic knobs participate in the formation of the myelin sheath.


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