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Oral function muscles Flashcards

1
Q

What are the 4 essential muscles for mastication (mandibular muscles)?

A
  • Masseter
  • Temporalis
  • Lateral pterygoid
  • Medial pterygoid
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2
Q

What is the ‘origin’ of the masseter muscle?

A
  • The zygomatic arch
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3
Q

What is the ‘insertion’ of the masseter muscle?

A
  • The lateral surface and angle of the mandible
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4
Q

What is the ‘action’ of the masseter muscle?

A
  • Elevates the mandible
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5
Q

How would you examine the masseter muscle?

A
  • Place one finger intra-orally and the other on the cheek
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6
Q

In which patients would the masseter muscle be tender?

A
  • In patients who have a clenching habit
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7
Q

What is the ‘origin’ of the temporalis muscle?

A
  • The floor of the temporal fossa
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8
Q

What is the ‘insertion’ of the temporalis muscle?

A
  • The coronoid process and anterior border of the ramus
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9
Q

What is the ‘action’ of the temporalis muscle?

A
  • Elevates and retracts the mandible
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10
Q

In which type of patient will the temporalis muscle be tender?

A
  • Patients who have a Bruxism habit
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11
Q

How would you examine the temporalis muscle?

A
  • Palpate its origin by asking the patient to clench the teeth together
  • Digital palpation is performed between the superior and inferior temporal lines just above the ear, extending forwards towards the supra-orbital region
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12
Q

What is the ‘origin’ of the lateral pterygoid muscle?

A
  • From the lateral surface of the lateral pterygoid plate
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13
Q

What is the ‘insertion’ of the lateral pterygoid muscle?

A
  • Anterior border of the condyle and intra-articular disc via two independent heads
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14
Q

What is the ‘function’ of the lateral pterygoid muscle?

A
  • Protrudes and laterally deviates the mandible and the inferior head functions with the mandibular depressors during opening
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15
Q

Where does the inferior belly of the lateral pterygoid attach to?

A
  • The head of the condyle
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16
Q

Where does the superior belly of the lateral pterygoid insert into?

A
  • The intra-articular disc
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17
Q

If someone has a clicking TMJ. Which muscle has been affected?

A
  • Spasm of the lateral pterygoid which pulls on joint
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18
Q

Can you examine the lateral pterygoid muscle by manual palpation?

A
  • No
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19
Q

How would you examine the lateral pterygoid muscle?

A
  • Best examined by recording its response to resisted movement
  • There is a good correlation between the resisted movement test and the muscle being tender to palpation
20
Q

What is the ‘origin’ of the medial pterygoid?

A
  • Deep head; medial surface of the lateral pterygoid plate

- Superficial head: tuberosity of maxilla

21
Q

What is the ‘insertion’ of the medial pterygoid?

A
  • Medial surface of the angle of the mandible
22
Q

What is the ‘action’ of the medial pterygoid?

A
  • Elevates and assist in protrusion of the mandible
23
Q

Is the medial pterygoid muscle able to be manually palpated?

A
  • No, because of the location of the medial pterygoid, on the inside of the jaw, this muscle in not available for palpation
24
Q

Can the medial pterygoid muscle be examined by resisted movement tests?

A
  • No, it does not respond well to these
25
Hoe can we examine the medial pterygoid muscle?
- Unfortunately there is no reliable way of examining this muscle 
26
Following an La injection, your patient was unable to open their mouth fully the following day. Which muscle was accidently hit by your needle?
- The medial pterygoid muscle 
27
Hitting the medial pterygoid muscle accidently when giving an ID block might cause 'trismus'. What does this mean?
- Inability to open mouth as wide as should be able to | - Limited mouth opening
28
What are the 2 movements of the TMJ?
- Rotation - initial movement | - Translation - Wider opening
29
What kind of movement is the 'rotation - initial opening' of the TMJ?
- A hinge movement 
30
The translation movement of the TMJ causes a wider opening on the mouth. These can be protrusive or retrusive movements. How does this occur?
- As the mandible moves during protrusion, both condyles leave their fossae and move forward along the articular eminences - When the mandible retrudes, both condyles leave the eminences and move back into their respective fossae
31
What is the name for the chart that represents the border movements of the jaw?
- Posselt's envelope 
32
What are the general maximum biting forces of molars?
200-700N
33
What is an example of a psychological factor in relation to max biting forces?
- Fear of tooth fracture when maximum forces are used | - This could limit the max biting force recorded
34
In relation to muscle mass, how does this affect the max biting force of an individual?
- Bigger muscles leads to larger forces 
35
What is an example of a parafunction in relation to max biting forces and muscle mass of the jaw?
- Bruxism 
36
What are the characteristics of  Type I muscle fibres? (2 points)
- Slow, low forces
37
What are the characteristics of  Type II muscle fibres? (2 points)
- Fast, strong forces 
38
What are different sub-types of type 2 muscle fibres? (3 points)
- IIA, IIX, IIB | - Predominant fibre type varies, depending on the jaw morphology and diet
39
What is there evidence of with people who have square jaws?
- Tend to have more Type II fibres and can generate stronger biting forces 
40
Why ate anterior teeth weaker than posterior teeth? (3 points)
- Smaller surface area of root - Posterior are nearer the centre of the force - Occlusal surface is larger
41
Which teeth generate the greatest biting forces between them and why?
- 1st molars - Position relative to TMJ and muscles (molars are nearer the force generating muscles and the fulcrum) - Root area large (PDL support)
42
The Suprahyoid and the Infrahyoid muscles are also muscles involved in mastication. What do they do?
- Stabalise the hyoid bone 
43
What are the 4 suprahyoid muscles?
- Digastric* - Mylohyoid* - Geniohyoid* - Stylohyoid - When the hyoid bone is fixes, by the contraction of the infrahyoid's, the starred muscles act as jaw depressors
44
What are the 4 infrahyoid ('strap') muscles?
- Sternohyoid - Omohyoid - Thyrohyoid - Sternothyroid
45
The intrinsic muscles of the tongue alter the shape of the tongue. What are the names of the intrinsic tongue muscles? (3 points)
- Longitudinal - Vertical - Transverse
46
The extrinsic muscles of the tongue alter the shape and position of the tongue. What are the names of the extrinsic tongue muscles? (4 points)
- Genioglossus - Hyoglossus - Palatoglossus - Styloglossus
47
Which 2 facial muscles help to control the food bolus and prevent spillage out of the mouth?
- Orbicularis oris | - Buccinator

BDS2 BAMS (57 decks)

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