1. Chapter 7 Muscles of the head and face.

2. Muscles of mastication Mastication = process of chewing “take your ‘TIME’ chewing your food. T = temporal Lifts / closes the jaw I = internal pterygoid Lifts the mandible M = masseter Lifts the mandible (strongest chewing muscle) E = external pterygoid Opens jaw / protrusion / lateral shifting

3. Temporal and masseter muscles

4. Internal / external pterygoid muscles

5. Muscles of facial expression Your smile is the ‘BOMZ’ B = buccinator Helps ‘pucker’ cheeks (blowing air) O = orbicularis oris Close or pucker lips M = mentalis Wrinkles chin / protrudes lower lip Z = zygomatic major Lifts corners of lips (smile)

6. Masseter → Zygomatic major → ← Orbicularis oris ← Mentalis

7. Muscles of the tongue Genioglossus Protrudes and retracts the tongue Hyoglossus Depresses the tongue Styloglossus Raises the tip of the tongue Palatoglossus Elevates the posterior of the tongue

8. Muscles of the tongue

9. Muscles of the floor of the mouth Digastric Assists in opening the mouth Mylohyoid Assists in lifting the tongue Stylohyoid Stabilizes the hyoid bone Geniohyoid Pulls the tongue towards the front of the mouth

10. Conclusion Please remember, these are the ‘major’ muscles of the head and neck. Please review and study ‘TIME’ and ‘BOMZ’ for testing purposes. Be aware of how the other muscles function in the oral cavity and their locations. Any questions?????