A Deterioration in the Myelin Sheaths of Motor Axons to the Lower

question 127

Multiple Choice

A deterioration in the myelin sheaths of motor axons to the lower leg would be expected to

• A) remove the restraints to ion movement and speed up impulse transmission.
• B) cause immobility of the leg due to cessation of impulses to leg muscles.
• C) slow the rate of transmission and cause lack of motor control.
• D) have little effect because the sheaths are for insulation only.
• E) cause paralysis.

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Definitions:

Sensation

The process of receiving and interpreting information from the environment through sensory receptors.

Motor Neurons

Nerve cells forming part of a pathway along which impulses pass from the brain or spinal cord to a muscle or gland.

Sensory Neurons

Neurons that transmit sensory information from the body to the central nervous system for interpretation.

Afferent Nerves

Nerves that carry sensory information from the body's periphery towards the central nervous system.