HEAD & NECK: Muscles of mastication

Question 1

Temporalis - origin

Answer 1

Temporal fossa (up to inferior temporal line), Temporal fascia

Question 2

Temporalis - insertion

Answer 2

Apex and medial surface of coronoid process of mandible

Question 3

Temporalis - innervation

Answer 3

Deep temporal branches (of mandibular nerve (CN V3))

Question 4

Temporalis - function

Answer 4

Anterior fibres: Elevates mandible
Posterior part: Retracts mandible

Question 5

Masseter [Superficial part] - origin

Answer 5

Maxillary process of zygomatic bone, Inferior border of zygomatic arch (anterior 2/3’s)

Question 6

Masseter [Deep part] - origin

Answer 6

Deep/inferior surface of zygomatic arch (posterior 1/3)

Question 7

Masseter - insertion

Answer 7

Lateral surface of ramus and angle of mandible

Question 8

Masseter - innervation

Answer 8

Masseteric nerve (of mandibular nerve (CN V3))

Question 9

Masseter - function

Answer 9

Elevates and protrudes mandible

Question 10

Lateral pterygoid [Superior head] - origin

Answer 10

Infratemporal crest of greater wing of sphenoid bone

Question 11

Lateral pterygoid [Inferior head] - origin

Answer 11

Lateral surface of lateral pterygoid plate of sphenoid bone

Question 12

Lateral pterygoid [Superior head] - insertion

Answer 12

Joint capsule of temporomandibular joint

Question 13

Lateral pterygoid [Inferior head] - insertion

Answer 13

Pterygoid fovea on neck of condyloid process of mandible

Question 14

Lateral pterygoid - innervation

Answer 14

Lateral pterygoid nerve (of mandibular nerve (CN V3))

Question 15

Lateral pterygoid - function

Answer 15

Bilateral contraction - Protrudes and depresses mandible, Stabilises condylar head during closure;
Unilateral contraction - Medial movement (rotation) of mandible

Question 16

Medial pterygoid [Superficial head] - origin

Answer 16

Tuberosity of maxilla, Pyramidal process of palatine bone

Question 17

Medial pterygoid [Deep head] - origin

Answer 17

Medial surface of lateral pterygoid plate of sphenoid bone

Question 18

Medial pterygoid - insertion

Answer 18

Medial surface of ramus and angle of mandible

Question 19

Medial pterygoid - innervation

Answer 19

Medial pterygoid nerve (of mandibular nerve (CN V3))

Question 20

Medial pterygoid - function

Answer 20

Bilateral contraction - Elevates and protrudes mandible
Unilateral contraction - Medial movement (rotation) of mandible