Flashcards in 12) TMJ and Infratemporal Fossa Deck (21):
What are the articulations in the temporomandibular joint?
Condyle of mandible
Articular tubercle (temporal bone)
What separates the articular surfaces?
What covers the articular surfaces?
What are the 3 extra-capsular ligaments of the TMJ?
What muscles cause elevation of the TMJ?
Temporal, masseter and medial pterygoid
What muscles cause depression of the TMJ?
Lateral pterygoid and supra/infrahyoid muscles (mainly gravity)
What muscle causes protrusion of the TMJ?
What muscle causes retrusion of the TMJ?
What muscles cause lateral movements of the TMJ?
Temporal on same side, pterygoids on opposite side and masseter
What is the nerve supply to the muscles of mastication?
Mandibular branch of trigeminal
Describe a TMJ dislocation:
Anterior causing head of mandible to move out of mandibular fossa (anterior to articular tubercle)
What can be damaged in a TMJ dislocation?
Facial and auriculotemporal nerves
What can cause a TMJ dislocation?
Blow to side of face, yawning or taking a large bite
What other TMJ disorders are there?
Bruxism (teeth grinding)
Inter-articular disk derangement
How do TMJ disorders usually present?
Pain in region of auriculotemporal nerve (V3)
What are the muscular contents of the infratemporal fossa?
Temporal, lateral and medial pterygoid muscles
What are the vascular contents of the infratemporal fossa?
Maxillary artery and vein
Pterygoid venous plexus
What are the nervous contents of the infratemporal fossa?
Mandibular nerve: inferior alveolar, lingual, buccal nerves
What pathology can occur in the infratemporal fossa?
Risk of cavernous sinus thrombosis due to communication with pterygoid plexus
What is the clinical relevance of the infratemporal fossa?
Used as site for mandibular nerve blocks