Oral Function

Question 1

Muscles

Masseter
1. Orgin
2. Insertion
3. Action

Answer 1

1. Zygomatic arch
2. lateral surface and angle of mandible
3. elevates mandible

Question 2

Muscles

Temporalis
1. origin
2. insertion
3. action

Answer 2

1. floor of temporal fossa
2. coronoid process and anterior border of ramus
3. elevates and retracts mandible

Question 3

Muscles

Lateral Pterygoid
1. Origin
2. Insertion
3. Function

Answer 3

1. from lateral surface of the lateral pterygoid plate
2. Inferior Belly: anterior border of the condyle
   Superior Belly: intra-articular disc via two indepent heads
3. protrudes and laterally deviates the mandible and the inferior head functions with the mandibular depressors during openings

Question 4

Muscles

Medial Pterygoid
1. Origin
2. Insertion
3. Action

Answer 4

1. deep head: medial surface of lateral pterygoid plate
   superficial head: tuberosity of maxilla
2. medial surface of angle of mandible
3. elevates and assists in protrusion of the mandible

Question 5

Muscles

what are the movements of TMJ?

two movements

Answer 5

Rotation (initial opening): Hinge movement
Translation (wider opening): Protusive or Retrusive movements

Question 6

Muscles

Characteristics of Type I muscle fibres

Answer 6

• slow
• low forces

Question 7

Muscles

Characteristics of type II muscle fibres

Answer 7

• fast
• stronger forces

Question 8

Muscles

What are the suprahyoid muscles?

Answer 8

• Digastroc
• Mylohyoid
• Geniohyoid
• Stylohyoid

Question 9

Muscles

What are the infrahyoid (‘strap’) muscles?

Answer 9

• Sternohyoid
• Omohyoid
• Thyrohyoid
• Sternothyroid

Question 10

Muscles