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Anatomy > Muscles Of Mastication > Flashcards

Muscles Of Mastication Flashcards

1
Q

Where do masticatory movements take place

A

The TMJ

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2
Q

What are some in pm bony features of the TMJ

A

The condyle
Glenoid flossa
Articulate eminence

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3
Q

What si the movement when the jaw opens

A

Hinge

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4
Q

What happens when the jaw opens widely

A

Hinge and slide

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5
Q

What happens In a protrusion

A

Slide Anteriorly

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6
Q

What happens in a lateral excursion

A

Working side - rotation around vertical axis

Non working side - translation

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7
Q

What are the four muscles of mastication

A

Masseter
Temporalis
Lateral and medial pterygoid

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8
Q

What innervates the muscles of mastication

A

The motor root of trigeminal nerve

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9
Q

What si the most powerful muscle of mastication

A

The masseter

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10
Q

What is the structure of the masseter

A

Quadrangle in shape split into two parts deep and superficial

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11
Q

What are the attachments of the masseter

A

Superficial originates form maxillary process of zygomatic bone
Deep part originates form zygomatic arch if temporal bone
Both parts attach a to the ramus of mandible

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12
Q

What are the actions of the masseter

A

Elevates the mandible closing the mouth

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13
Q

Where does the temporal bone originate

A

In the temporal fossa shallow depression on lateral aspect of skull

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14
Q

What covers the temporalis

A

Tough fascia this can harvested surgically and used to repair tymp mem perforated

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15
Q

What are the attachments of the temporalis

A

Originates form temporal fossa condenses to a tendon which inserts onto coronoid orocess of mandible

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16
Q

What are h actions of the temporalis

A

Elevated the mandible closing the mouth

Retracts the mandible pulling jaw Posteriorly

17
Q

What is the structure of the medial pterygoid

A

Quadrangle muscle with a deep and superficial head

18
Q

Where is the medial pterygoid located

A

Inferior to lateral pterygoid

19
Q

What are the attachments of the medial pterygoid

A

Superficial head originates form maxilla
Deep head originates from lateral pterygoid
Both parts attach to ramus of mandible near angle

20
Q

What si the action of the medial pterygoid

A

Elevates the mandible closing the mouth

21
Q

What si the shape of the lateral pterygoid

A

Triangular shape with two heads superior and inferior

22
Q

What are the muscle fibres like

A

Horizontal

23
Q

What do the two tendons of the lateral ptery do

A

Converge to a single tendon which attaches to the neck of mandible

24
Q

What are the attachments of the lateral ptery

A

Superior head originates form greater wing of sphenoid

Inferior head originates form lateral otery plate of sphenoid

25
Q

What si the action of the lateral ptery

A

Acting bilaterally, lateral pterygoid protract the mandible pushing the jaw forwards
Unilateral action produces side to side movement of jaw

26
Q

What are the 3 groups of muscles used in mastication

A

Between skull and mandible - muscles of mastication

Between mandible and hyoid

Hyoid stabilisers

27
Q

What are the muscles between the mandible and hyoid used for mastication

A

Genio hyoid c1 with hypoglossal
Mylohyoid Vc
Abd Vc

28
Q

What are the hyoid stabilisers

A

Infrahyoid
PBD
Stylohyoid

29
Q

What does the trigeminal nerve motor root do

A 
Exit brainstem at pons 
Carried with Vc 
Exit skull at formen ovale 
Nerves to 
- masseter
- temporalis 
- med ptery 
- lat ptery 
- mylohyoid 
- Abd
- tensor palatini 
- tensor tympani
30
Q

What ar the physiological chewing forces

A

70-150n dentate

4-55n Edentulous

31
Q

What are the maximum clenching forces

A

500-700n between molars

32
Q

What si mastication

A

Chewing
Breakdown foodstuffs to prep for swallowing, increase sa for digestion, release chemicals for taste
Stimulate salivary flow

Anatomy (44 decks)

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