Occlusion L2/L3 - TMJ and Masticatory muscles Flashcards
What joint is between the temporal bone and mandible?
Synovial joint
In a synovial joint what is the name given to the cartilage that surrounds the bone?
Hyaline articular cartilage
Where does the condyle sit in the TMJ?
Glenoid fossa
How many layers does the joint capsule have?
2 layers: outer fibrous layer and inner synovial membrane
The lateral ligament attaches to the lateral surface of the articular eminence to posterior surface of condyle, restricts what type of movement?
Restricts posterior, lateral and inferior movement.
The articular disc has 5 compartments what are the names of each compartment?
Posterior extension
Posterior band
Intermediate zone
Anterior band
Anterior extension
The posterior extension of the articular disc has 2 parts what are they?
Upper and lower layer
Upper layer – vascular and elastic
Lower layer – densely innervated and vascular
Anterior disc displacement with reduction results in a what?
Clicking of the TMJ
Muscles of mastication are associated in three group, through their respected locations. What are these locations?
Skull – mandible
Mandible to hyoid
Hyoid stabilisers
Which muscles are associated with skull-mandible?
Masseter
Temporalis
Medial pterygoid
Lateral pterygoid
Which nerve innervates the muscle of mastication?
Trigeminal V3 motor root
The masseter is broken down superficial and deep masseter. What is the origin and insertion of the superficial masseter?
Origin: zygomatic arch/bone
Insertion: angle/ramus of mandible
The masseter is broken down superficial and deep masseter. What is the origin and the insertion of the deep masseter?
Origin: Inner aspect of zygomatic arch
Insertion: angle/ramus of mandible
What is the origin and the insertion of the temporalis?
Origin: inferior temporal line and fascia
Insertion: coronoid process
What is the specific name given to nerve that innervates the temporalis?
Deep temporal nerve, V3 of the trigeminal nerve.
What is the origin and insertion of the lateral pterygoid?
Origin: lateral aspect of lateral pterygoid plate
Insertion: pterygoid fovea below head of condyle
What is the origin and insertion of the medial pterygoid?
Origin: medial aspect of the pterygoid plate and the maxillary tuberosity
Insertion: medial aspect of ramus/angle of mandible
What is the name of the three muscles that are associated with the mandible to hyoid group?
Geniohyoid
Mylohyoid
Anterior and posterior belly of digastric
