Masseter
• Quadrilateral muscle
• covers the lateral surface of ramus of mandible
Origin
1. Superficial Layer: anterior 2/3 of lower border of zygomatic arch
2. Deep layer: deep surface of zygomatic arch
3. Middle Layer: posterior 1/3 of lower border of zygomatic arch
Insertion
Superficial layer into lower part of lateral surface of ramus of mandible
Deep Layer into rest of the ramus Middle layer into central part of ramus
Nerve supply: Masseteric Nerve, branch of anterior division of mandibular Nerve
Action:
Elevation of mandible
Superficial fibres cause protrusion
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