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
What si the action of the lateral ptery
Acting bilaterally, lateral pterygoid protract the mandible pushing the jaw forwards Unilateral action produces side to side movement of jaw
26
What are the 3 groups of muscles used in mastication
Between skull and mandible - muscles of mastication Between mandible and hyoid Hyoid stabilisers
27
What are the muscles between the mandible and hyoid used for mastication
Genio hyoid c1 with hypoglossal Mylohyoid Vc Abd Vc
28
What are the hyoid stabilisers
Infrahyoid PBD Stylohyoid
29
What does the trigeminal nerve motor root do
``` 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
What ar the physiological chewing forces
70-150n dentate | 4-55n Edentulous
31
What are the maximum clenching forces
500-700n between molars
32
What si mastication
Chewing Breakdown foodstuffs to prep for swallowing, increase sa for digestion, release chemicals for taste Stimulate salivary flow