Temporomandibular joint II Head and Neck Anatomy

Dental occlusion: - Opening: rotaton and translocaton
- Dynamic system: TMJ, Teeth and muscles - Lateral: Working and non-working side
o LIMITED BY:
TMJ structures:  TMJ capsule and ligament
- Condyle  Teeth
- Fossa  Muscles
- Disc (meniscus) – artcular disc
- Capsule

Movements:
- Rotaton
- Translocaton
- Side to side

Movement Muscles involved:
Protrusion Lateral and medial pterygoids
Retracton Posterior fires oo Temporalis
Digastric/geniohyoid to lesser
extend
Elevaton Anterior/Middle fires oo
Temporalis
Superior and deep oo Masseter
Medial pterygoid
Lateral movement Medial and lateral pterygoid
Ipsilateral: Temporalis;
contralateral pterygoids pull Descriiing mandiiular movement (3D)
mandiile to ipsilateral side - Vertcal: open/close
- Anterior posterior: Protrusion/retracton
Hinge movement: 25º - Lateral: Laterotrusion/ Mediotrusion

Mandiiular movement:
- Voluntary
- Reflex: opening, closing, rhythmical