8.1 (Infratemp boundaries, mastication muscles action/innervation)

Question 1

Temporal Fossa: Posterior and superior boundaries

Answer 1

Superior and Inferior temporal lines

Question 2

Temporal Fossa: Anterior boundary

Answer 2

Frontal and Zygomatic bones

Question 3

Temporal Fossa: Lateral boundary

Answer 3

Zygomatic arch

Question 4

Temporal Fossa: Inferior boundary

Answer 4

Infratemporal crest

Question 5

Infratemporal Fossa: Posterior boundary

Answer 5

Tympanic plate, mastoid, styloid

Question 6

Infratemporal Fossa: Anterior boundary

Answer 6

Maxilla

Question 7

Infratemporal Fossa: Lateral boundary

Answer 7

Ramus of mandible

Question 8

Infratemporal Fossa: Medial boundary

Answer 8

Lateral pterygoid plate

Question 9

Infratemporal Fossa: Roof

Answer 9

Greater wing of sphenoid

Question 10

Muscles of Mastication (4)

Answer 10

Temporalis, Masseter, Lateral Pterygoid, Medial Pterygoid

Question 11

Innervation of Temporalis

Answer 11

CN V3 (via deep temporal nerves)

Question 12

Innervation of Masseter

Answer 12

CN V3 (via masseteric nerve)

Question 13

Innervation of Lateral Pterygoid

Answer 13

CN V3

Question 14

Innervation of Medial Pterygoid

Answer 14

CN V3

Question 15

Temporalis action

Answer 15

Elevates mandible, closes jaw (horizontal fibers retract mandible)

Question 16

Masseter action

Answer 16

Elevates mandible

Question 17

Lateral Pterygoid action

Answer 17

Bilaterally: Protracts mandible, depresses chin
Unilaterally: swings jaw towards contralateral side, larger lateral chewing movements

Question 18

Medial Pterygoid action

Answer 18

synergistic with Masseter to elevate mandible, contributes to protrusion, smaller grinding movements