41. Infratemporal fossa and TMJ Flashcards
Describe the infratemporal fossa
Space between skull and ramus of mandible
Anterior boundary of infratemporal fossa?
Posterior surface of maxilla
Posterior boundary of infratemporal fossa?
Styloid process
Superior boundary of infratemporal fossa?
Infratemporal surface of greater wing of sphenoid
Medial boundary of infratemporal fossa?
Lateral pterygoid plate
Lateral boundary of infratemporal fossa?
Ramus of mandible
Name the: Muscles x2 Nerve(s) x3 Artery Venous plexus That run in the infratemporal fossa
Lateral and medial pterygoid CNV3 Chorda tympani Otic ganglion Maxillary artery Pterygoid venous plexus
Action of medial pterygoid?
Assists in elevating the mandible
Action of lateral pterygoid?
Pulls the neck of the mandible forward
Innervation of the pterygoids?
CNV3
Name the nerves in the anterior division of CNV3? (5)
x2 deep temporal
Masseteric
Nerve to lateral pterygoid
Buccal
Name the nerves in the posterior division of CNV3? (4)
Lingual
Inferior alveolar
Myhlohyoid
Auriculotemporal
What are the pre-division branches of CNV3? (3)
Meningeal
Nerve to medial pterygoid
Communicating branch
What are the branches of the maxillary artery that go to muscles? (3)
Deep temporal
Masseteric
Pterygoid
Between the 2 heads of which muscle does the maxillary artery pass to go into the pterygomaxillary fissue?
Lateral pterygoid
What branch does the maxillary artery give off after passing into the pterygomaxillary fissure?
Posterior superior alveolar branch
What are the 3 parts of the maxillary artery?
Mandibular
Pterygoid
Pterygopalantine
What are the ptergopalantine branches of the maxillary artery? (3)
Posterior superior alveolar Infraorbital Descending palatine Artery of pterygoid canal Sphenopalantine
Does the pterygoid venous plexus surround the medial or lateral pterygoid?
Lateral
Into which vein does the ptergyoid venous plexus drain?
Maxillary
What nerve does the chorda tympani branch from?
Facial CNVII
What is the otic ganglion?
Parasympathetic ganglion in the infratemporal fossa
What does the otic ganglion innervate?
Parotid gland (with glossopharyngeal)
What type of joint is TMJ?
Synovial
What are the articulating surfaces of the TMJ?
Head of mandible and mandibular fossa
And articular tubercle on the squamous part of temporal bone
What 2 nerves supply the TMJ?
Auriculotemporal
Masseteric
What are the medial (2) and lateral (1) ligaments that support the capsule of the TMJ?
Medial - sphenomandibular and stylomandibular
Lateral - temporomandibular