A mother brings her 9-year-old son to the clinic for a routine check up. The 9-year-old boy has cerebral palsy and is very spastic. The mother asks the nurse what causes the spasticity in her son. What is the nurse's best response?
A) "Your son's spasticity is caused by injury to the muscle tissue."
B) "Your son's spasticity is caused by deficiency of a neurotransmitter called serotonin."
C) "Your son's spasticity is caused by damaged sensory neurons."
D) "Your son's spasticity is caused by damaged motor neurons."
D
Feedback:
Muscle spasticity is the result of damage to neurons within the central nervous system (CNS) rather than injury to peripheral structures such as the musculoskeletal system. Serotonin is not involved in the process of muscle contraction and relaxation. Although acetylcholine is released and increases muscle cell membrane permeability to sodium, which eventually leads to the release of calcium, this process does play a vital part in muscle contraction and relaxation.
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