NCERT Important Questions Class 9 Science biology Chapter 6
Important NCERT Extra Questions
Chapter 6 Tissues
NCERT Book Extra Questions for Session 2022-2023
CBSE Board and UP Board Others state Board
What is medullary sheath? Mention its significance
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Medullary (myelin)- Sheath is the covering of nerve fibres. It insulates the nerve fibre (axon) and prevents leakage of ions.