Question:medium
All of the following belong to the special visceral efferent column EXCEPT:
All of the following belong to the special visceral efferent column EXCEPT:
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Three are SVE cranial nerves; one is a brainstem nucleus.
Updated On: Jun 24, 2026
- Glossopharyngeal nerve
- Nucleus ambiguus
- Vagus nerve
- Trigeminal nerve
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The Correct Option is B
Solution and Explanation
Step 1: Recall the functional column. The special visceral efferent column drives the striated muscles that develop from the branchial arches, such as the muscles of mastication, facial expression, pharynx, and larynx.
Step 2: Identify the members. The nerves containing $SVE$ fibres are cranial nerves V, VII, IX, X, and XI.
Step 3: Separate nucleus from nerve. Among the options, the trigeminal, glossopharyngeal, and vagus are SVE nerves. The nucleus ambiguus is the source nucleus of SVE fibres for IX, X, and XI, but it is a nucleus rather than a nerve, so it does not belong in a list of SVE nerves.
Step 4: Conclude. The exception in this set is the nucleus ambiguus.
\[\boxed{\text{Nucleus ambiguus}}\]
Step 2: Identify the members. The nerves containing $SVE$ fibres are cranial nerves V, VII, IX, X, and XI.
Step 3: Separate nucleus from nerve. Among the options, the trigeminal, glossopharyngeal, and vagus are SVE nerves. The nucleus ambiguus is the source nucleus of SVE fibres for IX, X, and XI, but it is a nucleus rather than a nerve, so it does not belong in a list of SVE nerves.
Step 4: Conclude. The exception in this set is the nucleus ambiguus.
\[\boxed{\text{Nucleus ambiguus}}\]
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