muscles of mastication move the mandible during mastication and speech. They are Masseter Medial pterygoid Lateral pterygoid Temporalis

1. MUSCLES
OF
MASTICATION
D R A M I T H A G , B D S , M D S
O R A L A N D M A X I L L O F A C I A L P A T H O L O G Y

2. INTRODUCTION
The muscles of mastication move the mandible during mastication
and speech.
They are
1. Masseter
2. Medial pterygoid
3. Lateral pterygoid
4. Temporalis

7. RELATIONS OF LATERAL PTERYGOID
• Key muscle of the temporal and infratemporal region
• Its relation provides a fair idea about the layout of structures in
the infratemporal fossa
• Pterygoid plexus of veins surrounds the lateral pterygoid

8. SUPERFICIAL
• Masseter
• Ramus of the mandible
• Tendon of the temporalis
• Maxillary artery
DEEP
• Mandibular nerve
• Middle meningeal artery
• Spenomandibular ligament
• Deep head of medial pterygoid

9. • Structures emerging at the upper border
• Deep temporal nerves
• Masseteric nerve
• Structures emerging at the lower border
• Lingual nerve
• Inferior alveolar nerve
• Middle meningeal artery passes upwards deep to it.
• Structures passing through the gap between the 2 heads
• Maxillary artery enters the gap
• Buccal branch of the mandibular nerve comes out through the gap

10. RELATIONS OF MEDIAL PTERYGOID
Superficial Relations
• Upper part of the muscle is separated from the lateral pteyrgoid
muscle by
• Lateral pterygoid plate
• Lingual nerve
• Inferior alveolar nerve
• Lower down the muscle is separated from the ramus of the
mandible by the same nerves, the maxillary artery and
spenomandibular ligament.

11. Deep Relations
The relations are
• Tensor veli palatine
• Superior constrictor of pharynx
• Styloglossus
• Stylopharyngeus attached to the styloid process

12. THANK YOU