In which of the following are the medullated | vedclass

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(D) Medullated or myelinated nerve fibers are characterized by the presence of a myelin sheath around the axon. In vertebrates,myelinated fibers are g

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Cyclostomes

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(D) Medullated or myelinated nerve fibers are characterized by the presence of a myelin sheath around the axon. In vertebrates,myelinated fibers are generally present in the central and peripheral nervous systems. However,in $Cyclostomes$ (such as lampreys and hagfish),the nerve fibers are typically non-myelinated or unmyelinated. Therefore,$Cyclostomes$ are the group among the given options where medullated nerve fibers are not found.

In which of the following are the medullated (myelinated) nerve fibers $NOT$ found?

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