Mandible, TMJ and Muscles of mastication Flashcards Preview

Anatomy - Head and Neck > Mandible, TMJ and Muscles of mastication > Flashcards

Flashcards in Mandible, TMJ and Muscles of mastication Deck (18)
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1
Q

What sort of joint is the TMJ?

A

A synovial modified hinge joint

2
Q

What 2 articular processes form the TMJ?

A

Mandibular fossa of temporal bone

Articular process of the mandible

3
Q

What movements occur at the mandible?

A
Opening
Closing
Protrusion
Retrusion
Side to side movements
4
Q

What are the names of the 4 muscles that act on the TMJ during mastication?

A

Temporalis
Masseter
Medial Pterygoids
Lateral Pterygoids

5
Q

What are the bony attachments of the temporalis?

A

Temporal fossa

Coronoid process of the mandible

6
Q

How do the anterior fibres of the temporalis sit?

A

Vertically

7
Q

What action do the posterior fibres have on the mandible when they contract?

A

Retrusion

8
Q

What does the master do to the mandible?

A

Elevates and Protracts

9
Q

What do both the medial and lateral pterygoid muscles attach to?

A

Lateral pterygoid plate of the skull

10
Q

What does the medial pterygoid sit parallel to?

A

The masseter

11
Q

Which surface of the lateral pterygoid plate does the medial pterygoid muscle attach to?

A

Medial surface

12
Q

When the two lateral pterygoid muscles contract, what do they cause?

A

Protraction

Depression

13
Q

When the two medial pterygoid muscles contract, what do they cause?

A

Elevation

14
Q

Which 4 supra hyoid muscles cause mandibular depression?

A

Digastric muscle
Mylohyoid
Stylohyoid
Geniohyoid

15
Q

Innervation of the muscles of mastication is by what?

A

Branches of the mandibular division of the trigeminal nerve

16
Q

What is the only division of the trigeminal nerve that carries both sensory and motor fibres?

A

The mandibular division

17
Q

Where does the mandibular division of the trigeminal nerve emerge from?

A

The oval foramen of the cranial cavity

18
Q

The inferior alveolar nerves enter into the mandibular foramen and provide what?

A

Sensory innervation to the mandibular area