EMBRYOLOGY
NERVOUS SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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axons
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myelin sheath
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cell body
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dendrite
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Detailed explanation-1: -In this region, the axon is not covered by myelin.
Detailed explanation-2: -A myelin sheath is a sleeve (sheath) that’s wrapped around each nerve cell (neurons). It’s a protective layer of fat (lipids) and protein that coats the main “body” section of a neuron called the axon.
Detailed explanation-3: -A neuron in which there is no myelin sheath surrounding the axon. The unmyelinated neuron pertains to any of the neurons without myelin sheath (a sheath for the rapid conduction of action potential).
Detailed explanation-4: -The myelin sheath itself is made up of spirally arranged lamellae in which the intraperiod and dense lines alternate. Inside the myelin sheath an inner cytoplasmic process surrounds the axon and where the external surfaces of its bounding membrane come together an internal mesaxon is formed.