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Anatomy & Histology · single question

The structures within the infratemporal fossa are innervated primarily by branches of which nerve?

  1. Mandibular division of the trigeminal nerve (CN V3)
  2. Maxillary division of the trigeminal nerve (CN V2)
  3. Facial nerve (CN VII)
  4. Glossopharyngeal nerve (CN IX)
Show answer and explanation

Correct answer: A. Mandibular division of the trigeminal nerve (CN V3)

  • A. Correct. The infratemporal fossa contains the mandibular nerve (V3) and its branches (including the auriculotemporal, lingual, inferior alveolar, and buccal nerves), along with the muscles of mastication.
  • B. V2 (maxillary) traverses the pterygopalatine fossa, not primarily the infratemporal fossa.
  • C. CN VII does not provide the primary innervation of the infratemporal fossa contents.
  • D. CN IX is associated with the oropharynx/posterior tongue, not the infratemporal fossa.

Note: The source listed 'auriculotemporal' — a V3 branch that does traverse the fossa; the best overall answer is the V3 (mandibular) division.

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