WEEK 6 - TMJ

Question 1

What is the TMJ comprised of

Answer 1

• articular surfaces
• stabilising structures

Question 2

list the articular surfaces of TMJ

Answer 2

• head of the condyle of the mandible
• mandibular/glenoid/articular fossa and articular tubercle of the temporal bone
• articular disc

Question 3

list the stabilising structures of the TMJ

Answer 3

• joint capsule and lateral ligament
• postglenoid tubercle
• stylomanidbular ligament
• sphenomandibular ligament

Question 4

is TMJ atypical or typical synovial joint

Answer 4

atypical

Question 5

what makes TMJ atypical

Answer 5

articulating surfaces are fibrocartilage NOT hyaline

Question 6

what is the joint of the TMJ

Answer 6

GINGLYMOARTHRODIAL JOINT - hinge and sliding join t

Question 7

list the movements of the TMJ

Answer 7

depression (opening the mouth)
- anterior rotation
- translation
- anterior rotation
- elevation (closing mouth)
- portrusion - forward movement
- retrusion

Question 8

list the muscles of mastication

Answer 8

• temporalis
• masseter
• lateral pterygoid
• medial pterygoid

Question 9

list the accessory muscles of mastication

Answer 9

• digastric muscle
• buccinator muscle

Question 10

which muscles of mastication does not move the TMJ

Answer 10

BUCCINATOR
and anterior belly of digastric

Question 11

where does the massetter muscle originate from

Answer 11

zygomatic arch and the zygomer

Question 12

where does the lateral upper pterygoid muscle originate from

Answer 12

infratemporal surface of the sphenoid

Question 12

where does the lower lateral pterygoid muscle originate from

Answer 12

lateral side of the lateral pterygoid

Question 13

where does the superficial head of the medial pterygoid muscle originate from

Answer 13

palatine bone

Question 14

where does the deep head of the medial pterygoid muscle originate from

Answer 14

lateral pterygoid plate

Question 15

where does the temporalis muscle originate from

Answer 15

inferior temporal line of parietal bone

Question 16

list the arterial supply to TMJ

Answer 16

SAD
- superficial pharyngeal
- ascending pharyngeal
- maxillary artery

Question 17

list the arterial supply to the muscles of mastication

Answer 17

maxillary artery and superficial temporal artery

Question 18

what does the pterygoid branches of maxillary artery supply

Answer 18

medial and lateral pterygoid muscles

Question 19

what does masseteric branches of maxillary artery supply

Answer 19

massetter muscle

Question 20

what does the buccal branches of maxillary artery supply

Answer 20

buccinator

Question 21

where does the pterygoid venous plexus drains blood from

Answer 21

structures within the infratemporal fossa as well as the pterygopalatine fossa, and cavernous sinus via emissary veins

Question 22

what is trigeminal nerve formed by

Answer 22

sensory root and motor root from the brainstem

Question 23

where does the trigeminal nerve travel

Answer 23

anterolaterally over the posteromedial petrous part of the temporal bone

Question 24

where does the trigeminal nerve terminate

Answer 24

trigeminal sensory ganglion

Question 25

what does the ganglion in trigeminal nerve give rise to

Answer 25

ophthalmic maxillary mandibular divisions of trigeminal

Question 26

where does the motor root of the trigeminal nerve exit the skull via and which other division does it unite with

Answer 26

foramen ovale mandibular division

Question 27

where does the motor root of trigeminal nerve carry fibres from

Answer 27

mandibular nerve

Question 28

what type of sensory fibres from the muscles of mastication does trigeminal nerve contain

Answer 28

propioceptive

Question 29

list the branches of the mandibular nerve

Answer 29

- meningeal branch - medial pterygoid branch - nerve to tensor tympani

Question 30

where does the meningeal artery arise from

Answer 30

posterior surface of the mandibular trunk

Question 31

what does the meningeal artery travel with and where

Answer 31

middle meningeal arteryy through foramen spinosum

Question 32

what does meningeal artery provide

Answer 32

sensory fibres to middle cranial fossa

Question 33

what is the medial pterygoid branch closely associated with

Answer 33

otic ganglion

Question 34

where does the medial pterygoid branch pass through

Answer 34

otic ganglion

Question 35

what is the innervation of the pterygoid branch

Answer 35

motor innervation to medial pterygoid muscle

Question 36

innervation of tensor tympani

Answer 36

motor innervation to tensor tympani

Question 37

list the anterior divisions of the mandibular nerve

Answer 37

- deep temporal nerve - masseter nerve - lateral pterygoid nerve - long sensory buccal nerve

Question 38

list the posterior divisions of the mandibular nerve

Answer 38

- auriculotemporal nerve - inferior alveolar nerve

Question 39

list the branches of inferior alveolar nerve of mandibular nerve

Answer 39

- mylohyoid nerve - incisive nerve - mental nerve

Question 40

list the posterior division of mandibular nerve

Answer 40

lingual nerve