14. What are the cells that
produce the myelin sheath? Of
which substance is the myelin
sheath formed?

Gap-fill exercise

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In the central nervous (CNS) the
myelin sheath is by apposition of
oligodendrocyte . Each
oligodendrocyte can cover of
axons of several neurons. In
the peripheral system (PNS)
the myelin is made by
consecutive cell membranes
covering segments a single axon. The
’ nodes appear in the
space between these cells.
myelin sheath is rich lipids but it
also proteins.