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Anesthesia · single question

A patient is unable to lift the right upper lip. What could be the reason?

  1. 1 carpule of 2% Lidocaine infiltration into the maxillary labial vestibule
  2. Right infraorbital nerve block
  3. Right inferior alveolar block
  4. Posterior superior alveolar block
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Correct answer: B. Right infraorbital nerve block

The INFRAORBITAL NERVE (V2 branch) exits through the infraorbital foramen and innervates the skin/tissues between the lower eyelid and upper lip (upper lip, lateral nose, lower eyelid). An INFRAORBITAL BLOCK anesthetizes this region, causing inability to lift/feel the upper lip and surrounding area. A labial vestibule infiltration would numb only the local gingival/mucosal area — not the lip levator muscles' sensory area. The infraorbital block is the answer. B is correct.

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