development and anatomy of temporomandibular joint
TRANSCRIPT
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Dr Wajiha Qamar
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Joint of Jaw
2 TMJ’s working in union
Formed byMandibular fossa and articular
Tubercle of temporal boneCondyl of mandible
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GinglymoArthroidal joint
Condyl articulates with temporal bone in the mandibular fossa
Synovial joint enclosing synovial fluid
Develops in 12th week of intra uterine life
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Mandibular condyls
Articular surfaces of Temporal bone
Capsule
Articular disc
Ligaments
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Fibrous membrane that surrounds the joint
Covers the joint from all around
Thin above the disc and thick below it
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Fibro cartilaginous tissues
Disc divides the compartment into 2
Upper formed by Temporal bone and articular disc (Menisco temporal)
Lower formed by mandible and articular disc(Menisco mandibular)
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Major Ligament Temporomandibular ligament Capsular ligament
Minor Ligaments Stylo mandibular ligament Spheno mandibular ligament
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Other LigamentsOto mandibular ligamentDisco malleolar ligamentMallelo mandibular ligament
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Messeter
Temporalis
Medial pterygoid
Lateral pterygoid
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SENSORYAuriculo temporal nerveMesseteric nerve
MOTORMandibular division of trigeminal
nerve
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Branches of External Carotid ArterySuperficial temporal arteryDeep auricular arteryAnterior tympanic arteryAscending pharyngeal arteryMaxillary artery
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The Blood supply to TMJ is only Superficial, i.e there is no blood supply inside the capsule
TMJ takes its nourishment from Synovial fluid
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4 RECEPTORSRuffini receptorsPacinion receptorsGolgi tendon organsFree nerve endings
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Ruffini EndingsPosition the mandible
Pacinion ReceptorsAccelerate movement during
Reflexes Golgi tendon Organs
Protection of ligaments Around TMJ Free Nerve Endings
Pain receptors
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AnteriorlyMandibular notch
Messeteric nerve and artery Posteriorly
Tympanic plateGlenoid process of parotid gland
LaterallyParotid gland
Skin and fascia Medially
Maxillary artery and vein
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Rotational movement in first 20-25mm of mouth opening
Translational movement after that when the mouth is excessively opened
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1. Depression Of MandibleLateral pterygoidDigrastricGeniohyoid2. Elevation of Mandible Temporalis Masseter Medial Pterygoids
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3. Protrusion of MandibleLateral PterygoidsMedial Pterygoids
4. Retraction of Mandible Posterior fibres of Temporalis
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