Temporomandibular joint Flashcards Preview

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Flashcards in Temporomandibular joint Deck (27):
1

What bones form the Temporomandibular joint?

Mandible
Temporal bone of the cranium

2

What are the main movements allowed by the Temporomandibular joint?

Opening
Closing
Side to side movement

3

Where is the Temporomandibular joint?

Anterior to the tragus

4

What 3 bones articulate at the Temporomandibular joint?

Mandibular fossa
Articular tubercle (Squamous part of Temporal bone)
Head of the Mandible

5

What is unique about the Temporomandibular joint?

Articulating surfaces never touch due to the articular disc separating them.

6

What does the articulating disc split the joint into?

2 cavities;
Superior
Inferior

7

What type of joint is the Temporomandibular joint?

Synovial (Has a synovial membrane)

8

What type of cartilage covers the articulation surfaces?

Fibrocartilage (Not Hyaline as would b expected)

9

What are the 3 extra capsular ligaments?

Lateral ligament
Sphenomandibular ligament
Stylomandibular ligament

10

What is the lateral ligament attached to?

Beginning of the articular tubule to the mandibular neck

11

What is the function of the lateral ligament?

Thickening of the joint capsule
Prevents posterior dislocation of the joint

12

What is the Spenomandibular ligament attached to?

Sphenoid spine to mandible

13

What is the Stylomandibular ligament formed from?

Thickening of the fascia of the Parotid gland and facial muscles

14

What is the function of the Stylomandibular ligament?

Supports the weight of the jaw

15

What muscles control the movement of the Temporomandibular joint?

Muscles of mastication
Muscles of Hyoid bone

16

What movements does the upper section of the joint do?

Protrusion of mandible
Retraction of mandible

17

What muscle performs Protrusion of the mandible?

Lateral Pterygoid

18

What muscle performs Retraction of the mandible?

Geniohyoid
Digastric

19

What movements does the lower section of the joint do?

Elevation of mandible
Depression of mandible

20

What is the main cause of depression of the mandible?

Gravity

21

What muscles aid with depression of the mandible?

Digastric
Geniohyoid
Mylohyoid

22

What muscles aid elevation of the mandible?

Temporalis
Masseter
Medial Pterygoid
*Contraction of them, very strong movement*

23

How can arthritis effect the Temporomandibular joint?

Inflammation occurs in the joint causing the patient to commonly to have jaw pain, stiffness and joint grating

24

What can cause dislocation of the Temporomandibular joint?

Blow to the side of the face
Yawning
Taking a large bite

25

What occurs in a dislocation of the Temporomandibular joint?

Head of mandible slips out of the mandibular fossa and is pulled anteriorly so the patient is unable to close their mouth.

26

Why are posterior dislocations of the Temporomandibular joint rare?

A lot of force is needed to overcome the postglenoid tubercle and strong intrinsic lateral ligament

27

What can be damaged in a traumatic dislocation of the Temporomandibular joint?

Facial nerve
Auriculotemporal nerve