myelin sheath
Pronunciation
Noun
B2 Upper-intermediate
Quick answer
A fatty layer wrapped around many nerve fibers that speeds up the transmission of electrical signals along them.
Test yourself
Which word fits the gap? "In multiple sclerosis, the immune system mistakenly damages the _____ around nerves."
Answer: myelin sheath
In your own words, what does "myelin sheath" mean?
A fatty layer wrapped around many nerve fibers that speeds up the transmission of electrical signals along them.
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