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TMD > TMD 3 - Functional anatomy of masticatory system > Flashcards

TMD 3 - Functional anatomy of masticatory system Flashcards

1
Q

What does the infra-temporal fossa contain?

A 
Lateral and medial pterygoid muscles 
Pterygoid venous plexus 
Branches of V3 (mandibular division of trigeminal nerve)
Chorda tympani branch of facial N 
Maxillary artery and vein
Otic ganglion
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2
Q

What is the nerve supply of the anterior division of mandibular division of the trigeminal nerve?

A

Mainly motor - MOM

Sensory exception - long buccal nerve

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3
Q

What is the nerve supply of the posterior division of mandibular division of the trigeminal nerve?

A

Main sensory - general sensation to anterior 2/3 tongue and mandibular teeth
Motor exception - N to mylohyoid

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4
Q

What nerve does the chorda tympani hitchhike along?

A

Lingual N

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5
Q

What does the 1.chroda tympani and 2.lingual nerves supply?

A
  1. Taste to the anterior 2/3 of tongue

2. General sensation to the anterior 2/3 of tongue

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6
Q

What are the 2 bones of the TMJ joint?

A

Condylar process of the mandible

Articular fossa and eminence of temporal bone

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7
Q

What is the TMJ disc made of?

A

Fibrous cartilage

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8
Q

What is the arterial and nerve supply of TMJ?

A

Supf. temporal A.

Auriculotemporal and masseteric nerves

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9
Q

What are the 3 ligaments that reinforce the fibrous TMJ capsule?

A

Lateral ligament - articular tubercle to neck of mandible
Sphenomandibular ligament
Stylomandibular ligament

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10
Q

What are the movements of the mandible during mouth opening?

A

Depression and protrusion

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11
Q

What are the movements of the mandible during mouth closing?

A

Elevation and retraction

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12
Q

What are the muscles involved in protrusion of the TMJ and mandible?

A

Lateral pterygoid with help from medial pterygoid

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13
Q

What are the muscles involved in depression of the TMJ and mandible?

A

Gravity

Digastric, geniohyoid and mylohyoid

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14
Q

What are the muscles involved in elevation of the TMJ and mandible?

A

Temporalis, masseter and medial pterygoid

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15
Q

What are the muscles involved in retraction of the TMJ and mandible?

A

Temporalis, masseter, geniohyoid and digastric

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16
Q

What is the difference between hinge and translation movements of TMJ?

A

Hinge involves lower compartment - disc stationary and condyle moves
Translation involves upper compartment - disc and condyle move together

17
Q

What is the movement of the condylar process when fully opening the jaw?

A

The head of the condylar process must move forwards and out of the mandibular fossa onto the articular tubercle/eminence

TMD (4 decks)

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