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Anatomy 2 > Temperomandibular Joint > Flashcards

Temperomandibular Joint Flashcards

1
Q

What type of joints form the temporomandibular joint?

A

Plane and hinge synovial joints

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2
Q

What are the 2 superior articulations of the temporomandibular joint?

A
  1. Mandibular fossa of temporal bone

2. Zygomatic process of temporal bone

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3
Q

What is the inferior articulation of the temporomandibular joint?

A

Condylar process of mandible

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4
Q

What covers the articular surfaces of the temporomandibular joint?

A

Fibrocartilage

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5
Q

What is the superior attachment of the fibrous capsule found in the temporomandibular joint?

A

Area surrounding mandibular fossa and articular tubercle of temporal fossa

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6
Q

What is the inferior attachment of the fibrous capsule found in the temporomandibular joint?

A

Periphery of the condylar neck

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7
Q

What is the nerve supply of the fibrous capsule found in the temporomandibular joint??

A
  1. Auriculotemporal branch of mandibular nerve

2. Masseteric branch of mandibular nerve

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8
Q

What is the arterial supply of the fibrous capsule found in the temporomandibular joint?

A

Superficial temporal artery

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9
Q

What is the venous drainage of the fibrous capsule found in the temporomandibular joint?

A

Retromandibular vein

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10
Q

What ligament reinforces fibrous capsule surrounding the temporomandibular joint?

A

Lateral temporomandibular ligament

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11
Q

What are the 2 accessory ligaments of the temporomandibular joint?

A
  1. Stylomandibular ligament

2. Sphenomandibular ligament

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12
Q

Where is the lateral temporomandibular ligament attached?

A

Articular tubercle and neck of mandible

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13
Q

What is the function of the lateral temporomandibular ligament?

A

Prevents posterior and inferior displacement of the condyle

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14
Q

Where is the stylomandibular ligament attached?

A

Styloid process of temporal bone to angle of mandible

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15
Q

Where is the sphenomandibular ligament attached?

A

Spine of sphenoid and lingula of mandible

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16
Q

What movements does the lower part of the temporomandibular joint account for?

A

Hinge-like depression of elevation of head of the mandible

17
Q

What movements does the upper part of the temporomandibular joint account for?

A

Protrusion onto articular tubercle or retraction into mandibular fossa

18
Q

What 2 movements of the mandible causes the mouth to open?

A
  1. Depression

2. Protrusion

19
Q

How does the temporomandibular joint cause protrusion of the mandible?

A

Mandible and disc slide forward by lateral pterygoid assisted by medial pterygoid

20
Q

How does the temporomandibular joint cause retraction of the mandible?

A

Mandible and disc move posteriorly by posterior fibres of temporalis

21
Q

How does depression of mandible occur?

A

Gravity and suprahyoid

22
Q

What 3 muscles cause elevation of the mandible?

A
  1. Masseter
  2. Medial pterygoid
  3. Temporalis
23
Q

What is the bilateral action of the pterygoid muscles?

A

Side to side movement of the mandible

24
Q

How does an anterior dislocation of the mandible occur?

A

Head of mandible has been forced anteriorly so no longer articulates with mandibular fossa of temporal bone

25
Q

What is the way to reduce a dislocated jaw?

A

Pushing downwards on lower molar teeth and jaw backwards

26
Q

What is the function of downward pressure during the reduction of a dislocated jaw?

A

Overcomes tension of temporalis and masseter

27
Q

What is the function of backwards pressure during the reduction of the dislocated jaw?

A

Overcome spasm of lateral pterygoid

28
Q

What are the two terminal branches of the external carotid?

A
  1. Superficial temporal

2. Maxillary artery

29
Q

Where does the external carotid artery terminate?

A

Level of neck of the mandible

30
Q

What is the course of the maxillary artery once it arises from the external carotid?

A
  1. Passes over lateral pterygoid muscle

2. Disappears in the pterygopalatine fossa

31
Q

What divides the maxillary artery into 3 parts?

A

Lateral pterygoid muscle

32
Q

What is the venous drainage of the area supplied by the maxillary artery?

A

Pterygoid plexus of veins

33
Q

Where is the pterygoid plexus of veins found?

A

Lies between medial and lateral pterygoid

34
Q

What drains the pterygoid venous plexus?

A

Maxillary vein

35
Q

What are the 2 main communications of the pterygoid venous plexus?

A
  1. Cavernous sinus

2. Facial vein

36
Q

What connects the pterygoid venous plexus and cavernous sinus?

A

Emissary veins

37
Q

What connects the pterygoid venous plexus and facial vein?

A

Deep facial vein

Anatomy 2 (24 decks)

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