Temporomandibular joint

TMJ Type…. Articulating bones Capsule Synovial membrane Articular disc Ligaments. Movements.

articulation

Mandibular fossa &tubercle Type :- synovial,condylar. Articulating bones :-articular surfaces are covered by fibro-cartilage. Mandibular head Mandibular fossa &tubercle

I. Classification of Joints Types of Joints: Synovial

Type:. synovial but articular surfaces covered by fibrocartilage Type: *synovial but articular surfaces covered by fibrocartilage *contain articular disc (shape) *capsule attached to the articular surface

Lateral pterygoid muscle Capsule of TMJ Articular disc Lateral pterygoid muscle

ligaments The lateral tempromandibular ligament Ligaments capsule The lateral tempromandibular ligament Sphenomandibualr ligament Stylomandibualr ligament Ligaments

Important relations of tmj Anterior posterior

Medial lateral

Auriculotemporal nerve Sphenomandibular Ligament Maxillary A. Inf.alveolar N.&Vs. Medial aspect of TMJ

Nerve supply

Muscles of mastication 1- masseter

Temporalis

Lateral ptergoid

Medial pterygoid

Movements

Important questions 1-give short account on Tempromandibular joint Articulation 1. above : the articular tubercle and the mandibular fossa of the temporal bone 2. below : the head (condyloid process) of the mandible Type: synovial Enumerate ligament The lateral temporomandibular ligament, The sphenomandibular ligament , The stylomandibular ligament Nerve supply: Auriculotemporal and masseteric branches of the mandibular nerve

Give short account on lateral ptrygoid muscle Origin: greater wing of sphenoid and lateral ptrygoid plate Insertion: neck of the mandible and articular disc Nerve supply: mandibular nerve Action: pull neck of mandible forward All muscles of mastication innervated by mandibular nerve

MCQ Protrusion of the mandible is brought about by contraction of the…………. Lateral pterygoid muscle Temporalis muscle Masseter muscle Suprahyoid muscle The Chewing movement of the mandible is brought about by contraction of the…………. Lateral and medial pterygoid muscles the medial ptrygoid muscle ----------- the mandible Protrude Retract Depress Elevate

the lateral ptrygoid muscle ----------- the mandible Protrude Retract Depress Elevate the posterior fibers of temporalis muscle ----------- the mandible the masseter muscle ----------- the mandible the digastric and geniohyoid muscles ----------- the mandible