Facial Muscles

Question 1

Mastication Muscles Movements

Answer 1

Protrusion - moves mandible forward
Retraction - pulls mandible backwards
Elevation - elevates mandible and closes mouth
Depression - depresses mandible and opens mouth
Rotation - produces side to side movements

Question 2

Masseter Muscle

Answer 2

Origin: lower boarder of zygomatic arch bone
Insertion: lateral surface of mandible
Action: elevates the mandible

Question 3

Temporalis Muscle

Answer 3

Origin: temporal bone
Insertion: coronoid process and rambus of the mandible
Action: mainly elevates the mandible

Question 4

Medial Pterygoid Muscle

Answer 4

Origin: sphenoid, palatine and maxilla bone
Insertion: medial surfaces of the mandible
Action: elevation and rotation of the mandible

Question 5

Lateral Pterygoid Muscle

Answer 5

Origin: sphenoid bone
Insertion: mandibular condyle
Action: protracts, depresses and rotates the mandible

Question 6

Orbicularis Oris Muscle

Answer 6

Origin: medial aspects of maxilla and mandible
Innervation: buccal branch of facial nerve
Action: closes, protrudes and compresses; controls movement of lips eg sadness, anger
Bloody Supply: facial, maxillary, superficial temporal arteries

Question 7

Zygomaticus Minor Muscle

Answer 7

Origin: lateral aspects of zygomatic bone
Innervation: zygomatic and buccal branches of facial nerve
Action: elevates upper lip, exposes max teeth
Blood Supply: superior labial branch of facial artery

Question 8

Levator Labii Superioris Muscle

Answer 8

Origin: zygomatic process of maxilla
Innervation: zygomatic and buccal branches of facial nerve
Action: elevates upper lip
Blood Supply: facial, infraorbital branch of maxillary artery

Question 9

Zygomaticus Major Muscle

Answer 9

Origin: posterior lateral and zygomatic bone
Innervation: buccal and zygomatic branches of facial nerve
Action: elevates and everts angles of mouth
Blood Supply: superior labial and facial artery