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nmdcat.online July 28, 2026

The observed experimental result of applying a drug that specifically blocks somatic motor neurons would be complete paralysis of which of the following structures?

A. The muscular layer of the stomach
B. The walls of the systemic arteries
C. The myocardium of the left ventricle
D. The diaphragm and intercostal muscles
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📝 Explanation

Somatic motor neurons exclusively innervate skeletal muscles, which are responsible for voluntary movements and breathing (diaphragm and intercostal muscles). Smooth muscles (stomach, arteries) and cardiac muscle (myocardium) are innervated by the autonomic nervous system.

📖 Additional Information

  • The muscular layer of the stomach
  • The walls of the systemic arteries
  • The myocardium of the left ventricle
  • The diaphragm and intercostal muscles

Somatic motor neurons exclusively innervate skeletal muscles, which are responsible for voluntary movements and breathing (diaphragm and intercostal muscles). Smooth muscles (stomach, arteries) and cardiac muscle (myocardium) are innervated by the autonomic nervous system.

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