Question

Myelin sheath is broken up at regular intervals by delicate constrictions known as ???​

Answer 1

Answer:

Nodes of Ranvier. Two adjacent segments of myelin on one axon are separated by a node of Ranvier. ... The loops form membrane complexes with the axolemma called transverse bands, whereas myelin in the internodal region is separated from the axon by a gap of periaxonal space.

Explanation:

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Answer 2

Nodes of Ranvier

Explanation:

• The myelin sheath is a greatly extended and modified plasma membrane wrapped around the nerve axon in a spiral fashion and contains high proportion of sphingomyelin
• The periodic interruptions where short portions of the axon are left uncovered by myelin are the Nodes of Ranvier, and they are critical to the functioning of myelin
• Myelin sheath prevents leakage of ions across the membrane and prevent leakage of action potential
• Protects axons from physical stress
• Increase the speed of action potential