Nerve Fibers and Myelination Quiz

What is the function of the myelin sheath in nerve fibers?

• Nutrition at nodes of Ranvier

• Regeneration after injury

• Formation of Schwann cells

• Insulation and protection

Which type of nerve fibers are enveloped by Schwann cell sheath only in the PNS?

• Myelinated nerve fibers

• Unmyelinated nerve fibers

• Central nerve fibers

• Mixed nerve fibers

What is the function of the Schwann cell sheath in nerve fibers?

• Formation of myelin

• Insulation and protection

• Fast conduction of nerve impulse

• Regeneration after injury

Where are unmyelinated nerve fibers mainly present?

• Mixed nervous system

• Autonomic nervous system

• Peripheral nervous system

• Central nervous system

What is the main difference between myelinated nerve fibers in the PNS and CNS?

• Formation of myelin sheath

• Location of cell body

• Presence of Schwann cells

• Absence of neurilemma

Which cells form the myelin sheath in the CNS?

• Schwann cells

• Oligodendrocytes

• Fibroblasts

• Neurons

What is the function of the endoneurium in a peripheral nerve?

• Insulation and protection

• Formation of myelin

• Nutrition of axon

• Surrounding each nerve fiber separately

What is the main function of the perineurium in a peripheral nerve?

• Forming the blood nerve barrier

• Formation of myelin

• Insulation and protection

• Regeneration after injury

What is the structure of a myelinated nerve fiber when stained with H&E stain?

• Schwann cells lie on the myelinated axon

• Neurilemma forms the outer layer

• Only myelin sheath is stained

• Central eosinophilic axon surrounded by empty space

What is the main function of the epineurium in a peripheral nerve?

• Insulation and protection

• Regeneration after injury

• Covering the nerve trunk from outside

• Formation of myelin