Jaw musculature and TMJ Flashcards
What is the TMJ
The articulation between 3 bone surface:
mandibular fossa
articulations tubercle
head of mandible
Where does the articulate tubercle come from
The squamous part of the temporal bone
What are the extra capsular ligaments that act to stabilise the TMJ
Lateral ligament
Sphenomandibular ligament
Stylomandibular
What is the lateral ligament
Sometimes called the temporomandibular joint ligament
It is the major ligament for the joint and provides much strength for it and prevents dislocation
What does the stylomandibular ligament do
Along with the facial muscle, supports the weight of the jaw
What are the articulations surfaces of the bones separated by
The articular disc
What does the articulations disc do
Prevents the rubbing of the bones
What are the articulations surfaces of bone covered by
Fibrocartilage
What is the mandible formed by
The union of 2 halves, each having a horizontal body and a vertical ramp
What is the mandible angle
Where the ramus and the body meet
What are the processes of the ramus
The coronoid process and the condylar process
What is the coronoid process
The site of attachment for the temporal is muscle
What is the mandibular foramen
Passageway for neurovascular structures
What is the mental foramen
Passageway for neuromuscular structures
Where is the mental foramen
Below the second premolar tooth
What does the mental foramen transmit
Terminal branches of the inferior alveolar nerve and the mental artery
What is the mental spine
A small projection of bone on the posterior aspect of the mandible in the midline
What type of joint is the TMJ
Synovial
Why is it unusual that the surfaces of the joint are lined with fibrocartilage
Synovial joints are usually lined with hyaline cartilage
What is the capsule
A fibrous membrane that surrounds the joint and attached to the articular eminence, the articular disk and the neck of the mandibular condyle
What is the styloid process
Bone that extends down from the temporal bone just below the ear - aids with stabilisation
What can an elongated styloid process do
Cause mechanical damage to the carotid artery
What are the surfaces of the articular disc like
Concave undersurface and concavoconvex upper surface
What is the function of the concavoconvex upper surface
Provides friction free gliding surface for the condyle of the mandible and allows it to fit into the articular tubercle and fossa
