Infratemporal Fossa And TMJ Flashcards
Where is the temporal fossa?
Superior to the zygomatic arch
Where is the infratemporal fossa?
Inferior to the zygomatic arch
What is the lateral boundary of the infratemporal fossa?
Ramus of the mandible
What is the anterior border of the infratemporal fossa?
Maxilla
What is the medial border of the infratemporal fossa?
Lateral pterygoid plate
What is the roof of the infratemporal fossa?
Greater wing of the sphenoid
What is the posterior border of the infratemporal fossa?
Tympanic plate + mastoid and styloid processes
What is the inferior border of the infratemporal fossa?
Angle of the mandible
What are the contents of the infratemporal fossa?
Inferior portion of the temporalis muscle, lateral and medial pterygoid muscles, maxillary artery, pterygoid venous plexus and nervous structures
Which nervous structures are within the infratemporal fossa?
Branches of CN V3 including inferior alveolar, lingual and buccal nerves Chorda tympani (CN VII) and the otic ganglion
Where is the maxillary artery in relation to the lateral pterygoid?
Can run lateral or medial to the lateral pterygoid
Which muscles assist with opening the mandible?
Digastric, geniohyoid, mylohyoid and stylohyoid
Which muscles assist in opening the mandible/jaw by fixing the larynx and hyoid?
Sternohyoid, sternothyroid, thyrohyoid and omohyoid
Which structures are a part of the temperomandibular joint?
Joint capsule, articular disc, articular tubercle, postglenoid tubercle, inferior articular cavity, lateral (temporomandibular ligament) sphenomandibular ligament and stylomandibular ligament
What is the function of the sphenomandibular and stylomandibular ligaments of the TMJ?
Limit inferior excursion at the TMJ
Which nerve lies close to the TMJ?
Facial nerve
Which muscles attaches to the articular disc of the TMJ?
Superior head of the lateral pterygoid as well as part of the inferior head
What innervates the TMJ?
CN V including auriculotemporal, posterior deep temporal and masseteric nerves
What occurs with anterior dislocation of the TMJ?
Lateral pterygoids cause the heads of the mandible to dislocate anteriorly (pass anterior to the articular tubercles)
Where is the injection site for inferior alveolar nerve block?
Just lateral to the pterygomandibular raphe inside the mouth
Numbs teeth of lower dentition (mandibular teeth to the median plane)
Where is the injection site if you want to anesthetize the molars?
Right about the 2nd molar
Where is the injection site to anesthetize the premolars?
Further forward from the 2nd premolar at the 1st premolar
How do you anesthetize the anterior teeth?
Injection coming deep to the skin and toward the infraorbital foramen
Anterior (infraorbital) superior alveolar nerve block
What happens during gape of the TMJ at less than 15 degrees?
Simple hinging at the joint
What happens at greater than 15 degrees of gape at the TMJ?
Anterior gliding onto the articular eminence
