H&N 9.2 Temporomandibular joint and infratemporal fossa. Flashcards Preview

Skye's ESA 4 > H&N 9.2 Temporomandibular joint and infratemporal fossa. > Flashcards

Flashcards in H&N 9.2 Temporomandibular joint and infratemporal fossa. Deck (21)
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What type of joint is the TMJ?

Synovial hinge joint

(movement mainly only in one direction, small amount laterally)


What are the articulations of the TMJ?

Chondyle of the mandible
articular tubercle of the temporal bone
mandibular fossa


What is the articular disk of the TMJ?

a fibrous connective tissue which divides the TMJ into superior and inferior compartments


What ligaments support the TMJ?
Which is the most important?

-Lateral ligament (most important)

-stylomandibular ligament
-sphenomandibular ligament


Which muscles are involved in movment of the TMJ?

-lateral and medial pterygoids
-hyoid muscles


What muscles help to elevate the mandible?

-the temporalis, the masseter, the medial pterygoid


What muscles help to depress the mandible?

-mainly done by gravity

infra/suprahyoid muscles help


What muscle help to protrude the mandible?

-lateral pterygoid


What muscle helps to retract the mandible?

Temporal muscle


What muscles do lateral movements at the mandible?

temporal muscle of the same side,
pterygoids of the opposite side


What is the innervation of the muscles involved in movement of the TMJ?

The mandibular branch of the trigeminal nerve

Muscles of mastication.


What is locked jaw?

a TMJ dislocation when the head of the mandbile sits anteriorly to the articular tubercle of the temporal bone.


What is the general cause of locked jaw?

A blow to the side of the jaw when it is open


What must you consider in someone with locked jaw?

Dislocation of the other side of the mandible or a fracture.


Apart from locked jaw, what conditions can affect the TMJ?

-Bruxism (teeth grinding)
-interarticular disk derrangement


What is the infratemporal fossa?

-irregularly shaped space beneath the zygomatic arch and deep to the ramus of the mandible.


What are the borders of the infratemporal fossa?

-anterior- posterior maxilla

-posterior- temporal bone

-lateral- medial ramus

-medial- lateral pterygoid plate of sphenoid

-superior- greater wing of sphenoid

-inferior- medial pterygoid muscle


What are the contents of the infratemporal fossa?

-medial and lateral pterygoids
-temporal muscle
-maxillary artery
-pterygoid venous plexus
-mandibular nerve
-inferior alveolar nerve
-lingual nerve
-otic ganglion
-buccal nerve
-chorda tympani


Which nerves can be found within the infratemporal fossa?

-mandibular nerve
-inferior alveolar nerve
-buccal nerve
-lingual nerve
-chorda tympani
-otic ganglion


What are the branches of the mandibular nerve?

-inferior alveolar nerve (sensory to lower teeth)

-lingual nerve (sensory to anterior 2/3 tongue. and carries chorda tympani with it)

-buccal nerve (sensory to cheek)


What are some clinically relevant issues regarding the infratemporal fossa?

-site for isolated infections (rare, but can occur in diabetic patients, immuncompromised)

-infection can lead to cavernous sinus thrombosis (due to cavernous sinus connection with the pterygoid venous plexus)

-used as site for mandibular nerve block

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