13. What is the function of the
myelin sheath? Do all axons
present a myelin sheath?

Gap-fill exercise

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The function of myelin sheath is
improve the safety speed of the
impulse transmission along
axon. The myelin serves as an
insulator preventing the
of the impulse other
adjacent structures. the myelin
sheath gaps called Ranviers’
in itslength, the impulse “jumps”
from node to another
increasing the speed the neural
transmission.

all neurons have myelin sheath.
There myelinated axonal fibers
unmyelinated ones.