Question:

All are special visceral efferent column except :

Updated On: Jul 11, 2025
  • Glossopharyngeal n
  • Nucleus ambiguus
  • vagus nerve
  • trigeminal nerve
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The Correct Option is B

Solution and Explanation

The special visceral efferent (SVE) column contains cranial nerves responsible for innervating the muscles derived from the branchial arches. It includes the following nerves:
  • Glossopharyngeal nerve (CN IX): Innervates muscles derived from the third pharyngeal arch.
  • Vagus nerve (CN X): Innervates muscles derived from the fourth and sixth pharyngeal arches.
  • Trigeminal nerve (CN V): Innervates muscles derived from the first pharyngeal arch.
The Nucleus ambiguus is not a nerve; it is a motor nucleus in the medulla oblongata that contributes fibers to the glossopharyngeal, vagus, and accessory nerves but itself is not categorized as a special visceral efferent column. Hence, the correct answer is:
Nucleus ambiguus
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