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Anatomy 2 > Infratemporal Fossa and TMJ > Flashcards

Infratemporal Fossa and TMJ Flashcards

1
Q

What is the infratemporal fossa?

A

Space beneath the base of the skull between the skull and the ramus of the mandible

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2
Q

What are the boundaries of the infratemporal fossa?

A

Anterior - Posterior surface of the maxilla
Posterior - Styloid process
Superior - Infratemporal surface of the greater wing of sphenoid
Medial - Lateral pterygoid plate
Lateral - Ramus of the mandible

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3
Q

What is the contents of the infratemoral fossa?

A

Lateral and medial pterygoid, Mandibular division of trigeminal and branches, Maxillarty artery and branches, Pterygoid venous plexus, Chorda tympani and Otic ganglion

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4
Q

What is the function of the medial pterygoid?

A

Assists in elevating the mandible

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5
Q

What is the function of the Lateral pterygoid?

A

Pulls the neck of the mandible forward

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6
Q

What movements does both the medial and lateral pterygoid give?

A

Chewing movements

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7
Q

What innervates the medial and lateral pterygoid?

A

Mandibular division of CN V

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8
Q

What divisions does the mandibular division of trigeminal nerve have?

A

Anterior and posterior divisions

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9
Q

What are the anterior divisions of the mandibular division of CN V?

A

x2 deep temporal, masseteric nerve to lateral pterygoid, buccal (sensory)

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10
Q

What are the posterior divisions of the mandibular division of CN V?

A

Lingual (joined by chords tympani), inferior alveolar, mylohyoid and auricultemporal

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11
Q

What is the passage of the maxillary artery?

A

Passes between 2 heads of lateral pterygoid to go into ptergomaxillary fissure - fossa and give off posterior superior alveolar branch

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12
Q

What are the pre divisions of the mandibular division of CN V?

A

Meningeal, nerve to medial ptertgoid and communicating branch

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13
Q

What is the communicating branch in the pre divisions of mandibular division of CN V?

A

Tensor tympani and tensor velo palatini

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14
Q

What are the branches of the Maxillary artery?

A

Deep temporal, masseteric and pterygoid branched to muscles

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15
Q

What are the 3 parts of the maxillary artery?

A

Mandibular, pterygoid and pterygopalatine

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16
Q

What are the Pterygopalatine branches?

A

Posterior superior alveolar, Infraorbital, anterior superior alveolar branches and palatine, pharyngeal and sphenopalatine branches.

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17
Q

What does the pterygoid venous plexus surround?

A

Lateral pterygoid

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18
Q

Where are the veins of the pterygoid venous plexus from?

A

Orbit, nasal and oral cavities

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19
Q

What does the pterygoid venous plexus communicate with?

A

Cavernous sinus and facial vein

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20
Q

What drains the pterygoid venous plexus?

A

Maxillary vein

21
Q

What is the route for infection?

A

Pterygoid venous plexus

22
Q

What is involved in the posterior superior alveolar branch?

A

Upper molar and premolar

23
Q

What is involved in the infraorbital branch?

A

Canal in floor of orbit, foramen

24
Q

What is involved in the anterior superior alveolar branch?

A

Upper incisor and canine

25
Q

Has the otic ganglion have a synapse?

A

No

26
Q

What goes through the otic ganglion?

A

Postganglionic sympathetic fibres and motor neves to tensor tympani and tensor veli palatine (CN VIII)

27
Q

What happened at the foramen oval?

A

Has the mandibular division

28
Q

What joint in the temporomandibular joint (TMJ)?

A

Synovial joint

29
Q

Where is the TMJ?

A

Between the head of mandible and mandibular fossa and articular tubercle on the squamous part of the temporal bone?

30
Q

What type of cartilage covers the articular surfaces of TMJ?

A

Fibrocartilage (membranous ossification)

31
Q

What is the nerve supply of the TMJ?

A

Auriculotemporal and masseteric

32
Q

What reinforces the TMJ capsule?

A

Lateral (temporomandibular) ligament

33
Q

What supports the TMJ medially?

A

Sphenomandibular and stylomandibular ligaments

34
Q

What dos the lateral pterygoid attach to?

A

Articular disc and capsule

35
Q

What is the cavity of TMJ divided by?

A

Fibrous articular disc

36
Q

What does the TMJ disc increase?

A

Congruity of articular surfaces

37
Q

What movements does the head of mandible and disc?

A

Elevation and depression (hinge)

38
Q

What gives protrusion and retraction (gliding) in the TMJ?

A

Disc and mandibular fossa and articular process

39
Q

What movements close the mouth?

A

Elevation and retraction pull condyle backwards

40
Q

What movements open the mouth?

A

Both sides depression and protrusion to slide disc and condyle forwards towards tubercle

41
Q

What is the movement of chewing called?

A

Asynchronous gliding

42
Q

Describe elevation of the mandible?

A

Head of mandible and disc move backward and head rotated on lower surface of disc

43
Q

What muscles aid in elevation the mandible?

A

Temporalis, masseter and medial pterygoid

44
Q

Describe depression of the mandible?

A

Hey of mandible rotates on undersurface of articular disc and mandible is pulled forward

45
Q

What muscles aid in depression of the mandible?

A

Lateral pterygoid, digastric, geniohyoid, mylohyoid and gravity

46
Q

Describe protrusion of the mandible?

A

Articular disc and head of mandible move forward

47
Q

What muscles aid in protrusion of the mandible?

A

Lateral pterygoid

48
Q

Describe retrusion of the mandible?

A

Articular disc and head of mandible pulled backwards into mandibular fossa

49
Q

What muscles aid in retrusion of the mandible?

A

Posterior fibres of temporalis

Anatomy 2 (26 decks)

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