Week 2 - Muscles of the Face and Mastication

Question 1

Origin, insertion + innervation of the buccinator

Answer 1

Origin: Floor of temporal fossa
Insertion: Coronoid process (of mandible)
Innervation: CNVII (facial nerve)

Question 2

Function, innervation and blood supply of orbicularis oris

Answer 2

Function: Pushing food out from cheeks, part of swallowing, sucking and mastication
Innervation: Sensory: trigeminal (mandibular, CNV3), Motor: facial (CNVII)
Blood supply: facial artery

Question 3

Origin, insertion + innervation of temporalis

Answer 3

Origin: temporal fossa
Insertion: coronoid process/ramus
Innervation: Mandibular nerve (CNV3)

Question 4

Origin, insertion + innervation of masseter

Answer 4

Origin: zygomatic arch
Insertion: angle/lateral surface of mandibular ramus

Question 5

Origin, insertion + innervation of lateral pterygoid

Answer 5

Origin:
Superior head: infratemporal surface of the greater wing of the sphenoid bone
Inferior head: lateral surface of the lateral pterygoid plate,
Insertion: both on the pterygoid fovea of the mandible.
Innervation: CNV3

Question 6

Origin, insertion + innervation of medial pterygoid

Answer 6

Origin:
Superficial head: maxillary tuberosity + palatine bone
Deeper head: medial surface of lateral pterygoid plate of sphenoid bone
Insertion: medial surface of mandibular ramus and angle.
Insertion:
Innervation: CNV3

Question 7

Muscles of mastication

Answer 7

• Temporalis
• Masseter
• Lateral + medial pterygoid

Question 8

Which muscles facilitate protrusion?

Answer 8

Lateral + medial pterygoid

Question 9

Which muscles facilitate retraction?

Answer 9

Parts of: temporalis + masseter

Accessories: digastric + geniohyoid

Question 10

Which muscles facilitate elevation?

Answer 10

Temporalis, masseter, medial pterygoid

Question 11

Which muscles facilitate depression?

Answer 11

Lateral pterygoid

Accessories: digastric, geniohyoid, mylohyoid

Question 12

Which muscles facilitate lateral/side to side movements?