Mastication Muscles

Can you name these 4 mastication (jaw) muscles of the human body based on the provided origin (O), insertion (I), and action (A)?

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Last updated: January 13, 2026

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Hint	Answer
O: zygomatic arch; I: mandibular ramus/angle; A: elevate mandible	Masseter
O: temporal fossa; I: coronoid process; A: elevate/retract mandible	Temporalis
O: medial surface lateral pterygoid plate & maxilla; I: medial mandibular ramus; A: elevate/protrude	Medial pterygoid
O: sphenoid & lateral pterygoid plate; I: mandibular condyle/TMJ disc; A: protrude/depress, side-to-side	Lateral pterygoid

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