SCIENCE
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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ependymal cells
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oligodendrocytes
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Schwann cells
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astrocytes
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Detailed explanation-1: -Schwann cells make myelin in the peripheral nervous system (PNS: nerves) and oligodendrocytes in the central nervous system (CNS: brain and spinal cord). In the PNS, one Schwann cell forms a single myelin sheath (Figure 1A).
Detailed explanation-2: -CNS myelin is produced by special cells called oligodendrocytes. PNS myelin is produced by Schwann cells. The two types of myelin are chemically different, but they both perform the same function-to promote efficient transmission of a nerve impulse along the axon.
Detailed explanation-3: -Schwann cells originate from the neural crest, which is a group of embryonic cells.
Detailed explanation-4: -Schwann cells (SCs) are the main glial cells of the peripheral nervous system which wrap around axons of motor and sensory neurons to form the myelin sheath.
Detailed explanation-5: -The myelin sheath (MS) surrounding the axon (Ax) and the Schwann cell nucleus (S) are clearly visible. B, Cross section of a bundle of unmyelinated axons of an adult mouse sciatic nerve.