Head and Neck - TMJ Module 5

The TMJ is the articulation between which bones?

Temporal and mandibular

Articular fossa

Concave depression in the lower part of the temporal bone

Articular eminence

Convex ridge of bone anterior to the articular fossa

Condyle of the mandible

Articulates with the temporal bone

Joint capsule

Fibrous capsule that completely encloses the TMJ

Joint disc

Fibrous pad between the bones (biconcave)

Upper joint space is for what movements?

Translational or gliding

Lower joint space is for what movements?

Depression and elevation

What does synovial fluid do?

Lubricates joint to prevent friction, and provides nutrients to tissues

Ligaments do what?

Link Like bones

Purpose of a ligament

Hold the joint together

Ligaments of the TMJ

Stylomandibular, Sphenomandibular, and Temporomandibular joint ligament

2 movements of the TMJ

Rotational and Gliding

Gliding is when…

Jaw opens really wide

In gliding, condyle moves from what to what

Articular fossa to the articular eminence

Subluxation

Dislocation of both joints

TMD

Temporomandibular disorders

Most common TMD

Disc displacement

Normal overjet

1-3 mm

Normal overbite

2-5mm

Malocclusion can contribute to

Occlusal trauma