Which of the following statements about the mandibular nerve is INCORRECT?

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The sensory branches originate from the anterior division.The muscles involved in mastication receive innervation directly from the main trunk.The nerve to the medial pterygoid comes off the main trunk.The buccal nerve supplies the buccinator muscle.

Explanation

The sensory branches of the mandibular nerve do arise from the anterior division, and the nerve to the medial pterygoid branches from the main trunk. The buccal nerve is purely sensory and does not innervate the buccinator muscle; instead, the buccinator is innervated by the facial nerve. Importantly, muscles of mastication are innervated by branches of the anterior trunk, not directly from the main trunk, making option B incorrect.