TMJ muscles

Question 1

Medial Pterygoid

Answer 1

O - Medial surface of lateral portion of pterygoid process of shphenoid bone SUP head; maxiall and Palatine
I - inferior surface, angle and ramus of mandible
A - Elevates, Protracts, Lateral dev. Mandible
N - Trigeminal Nerve

Question 2

Lateral pterygoid

Answer 2

Sup- Greater wing and lateral surface of latera portion of pterygoid process of sphenoid bone
Insertion - SUp - capsule and articular disc of
INF- neck of mandible
Action - Protracts, Depresses CONTRAlateral DEV., Mandible

Question 3

Platysma

Answer 3

O-Subcutaneous Fascia of Upper chest
I- Mandible + Subcutaneous Fascia, Lower Face
A- Draws up skin, creates ridges, pulls lower lip laterally
N- Facial CN VII

Question 4

Temporalis

Answer 4

O - Temporal Fossa (Parietal, Frontal, Sphenoid, Temporal bones)
I - Coronoid Process and Anterior border of Ramus of Mandible
A- Elevates and retracts Mandible
N - Trigeminal Nerve CN V

Question 5

Masseter

Answer 5

O - Inferior Surface, Zygomatic Arch
I- Angle and Ramus of Mandible
A- Elevates and Protracts Mandible @ TMJ
N- Trigeminal CN VII