Questions: Which type of neuroglia cell forms myelin sheaths on axons within the peripheral nervous system? (A) Schwann cells (B) Oligodendrocytes (C) Ependymal cells (D) Astrocytes

Which type of neuroglia cell forms myelin sheaths on axons within the peripheral nervous system? (A) Schwann cells (B) Oligodendrocytes (C) Ependymal cells (D) Astrocytes
Transcript text: Which type of neuroglia cell forms myelin sheaths on axons within the peripheral nervous system? (A) Schwann cells (B) Oligodendrocytes (C) Ependymal cells (D) Astrocytes
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Solution

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The answer is the first one (A): Schwann cells.

Explanation for each option: (A) Schwann cells: Correct. Schwann cells are responsible for forming myelin sheaths around axons in the peripheral nervous system (PNS). These myelin sheaths are essential for the rapid transmission of electrical signals along the nerve cells.

(B) Oligodendrocytes: Incorrect. Oligodendrocytes form myelin sheaths, but they do so in the central nervous system (CNS), not the peripheral nervous system.

(C) Ependymal cells: Incorrect. Ependymal cells line the ventricles of the brain and the central canal of the spinal cord. They are involved in the production and circulation of cerebrospinal fluid (CSF) but do not form myelin sheaths.

(D) Astrocytes: Incorrect. Astrocytes are star-shaped glial cells in the CNS that provide support and nutrition to neurons, maintain the blood-brain barrier, and repair the brain and spinal cord following traumatic injuries. They do not form myelin sheaths.

Summary: Schwann cells are the type of neuroglia that form myelin sheaths on axons within the peripheral nervous system.

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