temporomandibular joint. dr. gaurav salunkhe
DESCRIPTION
temporomandibular jointTRANSCRIPT
PRESENTD BY:DR. GAURAV S. SALUNKHE
PG- STUDENT ORAL & MAXILLOFACIAL
PATHOLOGY
Temporomandibular Joint
INTRODUCTION
The temporomandibular joint is the joint of the jaw and is frequently referred to as TMJ.
ALSO KNOWN AS MANDIBULAR JOINT.TYPE-SYNOVIAL JOINTSUBTYPE-BICONDYLAR The name is derived from the two bones which form
the joint: the upper temporal bone which is part of the cranium (skull), and the lower jaw bone called the mandible.
The unique feature of the TMJs is the articular disc.The part of the mandible which mates to the under-
surface of the disc is the condyle and the part of the temporal bone which mates to the upper surface of the disk is the glenoid (or mandibular) fossa.
Components
There are six main components of the TMJ.Mandibular condylesArticular surface of the temporal boneFibrous CapsuleArticular discLigamentsLateral pterygoid
Sphenomandibular & Stylomandibular ligament
RELATIONS
INFRONT LATERAL PTERYGOID,TEMPORALIS, MASSETERIC NERVE &
VESSELS
BEHIND PAROTID GLAND, SUPERFICIAL TEMPORAL
VESSELS, AURICULOTEMPORAL
NERVE
LAERALLY SKIN, FASCIA
MEDIALLY LATERAL PTERYGOID, MIDDLE MENINGEAL ARTERY, SPINE OF SPHENOID WITH
SPHENOMANDIBULAR LIGAMENT
MOVEMENTS
1. ELEVATION & DEPRESSION
2. PROTRACION & RETRACTION
3. SIDE TO SIDE MOVEMENS
MOVEMENTS
Depression- lateral pterygoid mainlyElevation- masster, temporalis, medial
petygoid of both sides.Protrusion- lateral and medial pterygoid.Retraction- posterior fibres of temporalis.Lateral or side to side movement eg.
turning chin to left side- left lateral pterygoid and right medial pterygoid.
INNERVATION & VASCULARIZATION
Sensory innervation of the temporomandibular joint is derived from the auriculotemporal and masseteric branches of TRIGEMINAL NERVE.
Its arterial blood supply is provided by branches of the EXTERNAL CAROTID ARTERY, predominately the superficial temporal branch.
Other branches: deep auricular artery, anterior tympanic artery, ascending pharyngeal artery, and maxillary artery- may also contribute.
HISTOLOGY
Bony structures
Articular fibrous covering
Articular disk
Synovial membrane
CLINICAL CONSIDERATIONS
Most common disorder- Disc displacement. Most common cause of pain- Myofascial pain
dysfunction syndrome.Temporomandibular joint disorder/ syndrome.Conditions that affect joint.1) Ankylosis 2) Arthritis3) Trauma4) Developmental anomalies5) Neoplasia
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