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Oral Surgery · single question

The nerve supply to the UPPER FIRST PREMOLAR (#5) is:

  1. Posterior superior alveolar nerve (PSA)
  2. Greater palatine nerve
  3. Anterior superior alveolar nerve (ASA)
  4. Middle superior alveolar nerve (MSA) — supplies maxillary premolars and mesiobuccal root of first molar
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Correct answer: D. Middle superior alveolar nerve (MSA) — supplies maxillary premolars and mesiobuccal root of first molar

  • A. The Posterior Superior Alveolar nerve (PSA) innervates the maxillary second and third molars, and the distobuccal and palatal roots of the maxillary first molar.
  • B. The greater palatine nerve provides sensory innervation to the palatal mucosa, not the premolar teeth pulp.
  • C. The Anterior Superior Alveolar nerve (ASA) innervates the maxillary incisors and canine.
  • D. Correct. The MIDDLE SUPERIOR ALVEOLAR NERVE (MSA) is present in about 70% of individuals and innervates the maxillary PREMOLARS (#4 and #5) and the MESIOBUCCAL root of the maxillary first molar. When the MSA is absent (30% of population), the ASA and PSA overlap to cover the premolars. For dental anesthesia of the premolars, the infraorbital nerve block is most reliable (blocks ASA and MSA).

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