A myelin sheath is a
A) nerve network within the spinal cord that controls physical arousal.
B) large band of neural fibers connecting the two adrenal glands.
C) layer of fatty tissue encasing the axons of some nerve cells.
D) bushy extension of a neuron that conducts impulses toward the cell body.

Question

Quizplus · Accepted Answer

A myelin sheath is a layer of fatty tissue that surrounds and insulates the axons of some nerve cells. This insulation helps to speed up the transmission of neural impulses. The myelin sheath is produced by specialized cells called Schwann cells in the peripheral nervous system and oligodendrocytes in the central nervous system.

A Myelin Sheath Is a