Muscles of mastication

Question 1

Masseter

Answer 1

origin: Maxilla & zygomatic arch
Insertion: mandible
Action: Elevates mandible
Innervation: Trigeminal nerve

Question 2

Temporalis

Answer 2

Origin: temporal bone
Insertion: Mandible
Action: Elevates and retracts mandible
Innervation: Trigeminal nerve

Question 3

Medial Pterygoid

Answer 3

origin : Sphenoid bone (pterygoid process), maxilla
Insertion : Mandible
Action : Elevates and protrusion of mandible, lateral movements of mandible
Innervation : Trigeminal nerve

Question 4

Lateral Pterygoid

Answer 4

Origin : Sphenoid bone (pterygoid process)
Insertion: Mandible, temporomandibular joint
Action : Depresses and protrudes mandible; lateral movement of mandible
innervation : Trigeminal nerve

Question 5

Buccinator

Answer 5

Origin: Maxilla, mandible, and sphenoid bone (pterygoid process)
Insertion: Orbicularis oris
Action : Presses cheeks against lips (sucking, whistling); assists in mastication
Innervation: Facial nerve