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DENTIN NBDE & NBDHE ALERT! MUSCLES OF MASTICATION

Ricky Rubin

The four pairs of muscles of mastication are innervated by the MANDIBULAR DIVISION (V3) of the TRIGEMINAL NERVE and receive blood supply from the PTERYGOID BRANCH OF THE MAXILLARY ARTERY (the larger terminal branch of the external carotid artery).

  1. TEMPORALIS: anterior & superior fibers ELEVATE THE MANDIBLE. Posterior fibers RETRACT THE MANDIBLE and maintain the resting position when the mouth is closed.
  2. MASSETER-THE MOST POWERFUL MASTICATORY MUSCLE that ELEVATES the MANDIBLE to occlude teeth. Forms a sling around the angle of the mandible.
  3. MEDIAL PTERYGOID-ELEVATES THE MANDIBLE & MOVES IT LATERALLY.
  4. LATERAL PTERYGOID (2 Heads)-OPENS & PROTRUDES THE MANDIBLE & MOVES IT LATERALLY (SIDE-TO-SIDE).  For right lateral excursive movements, the left lateral pterygoid muscle is the primary mover, while for left lateral movements the right lateral pterygoid is the primary mover.

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