TEMPOROMANDIBULAR JOINT
Temporomandibular joint
- Type ( प्रकार )
- Synovial
- Condylar type ( स्थूलक )
- Articular surfaces
- Upper articular surfaces : ( ऊपरी संधायक स्तर/मुख )
- Articular tubercle ( संधायक गण्डिका )
- Anterior part of mandibular fossa ( अधःहनु का अग्र खात )
- Posterior non articular part formed by tympanic plate ( कर्णपटह पत्ताल का विसंधायक पश्चभाग )
- Inferior articular surface is formed by head of mandible ( निम्न मुख हनु का मुंड )
- Coverings ( छादन )
- Covered with fibrocartilage ( तन्तुउपास्थि )
- Cavity ( गुहाा )
- Joint cavity divided by intraarticular disc ( दो भाग में बाँटता है , अंतरा संधायक चाप )
- Upper and ( ऊपर )
- Lower part ( नीचे )
- Ligaments ( स्नायूबंधन )
- Fibrous capsule ( तन्तु परिच्छद )
- Attached ( जुड़ता हैं )
- Above to ( ऊपर में )
- articular tubercle , circumference of mandibular fossa in front and squamotympanic fissure behind
- Below
- Neck of mandible ( अधःहनु के गर्दन से )
- Capsule ( परिच्छद )
- Loose above intra articular disc ( ऊपर का ढीला ) and tight below it ( नीचे का सख्त )
- Synovial membrane lines the fibrous capsule and neck of mandible
- Lateral temporomandibular ligament ( पार्श्व शंखहनु स्नायुबंधन )
- Reinforces and strengthens lateral part of capsular ligament
- Fibers directed downwards and backwards ( तन्तु नीचे और पीछे की ओर )
- Attached ( जुड़ता है )
- above to articular tubercle ( ऊपर )
- Below to posterolateral aspect of neck of mandible ( नीचे
- Sphenomandibular ligament ( पक्षहनु स्नायूबंधन )
- Accessory ligament
- Lies in a deep plane away from fibrous capsule ( तंतुमय परिच्छद से दूर रहता है )
- Attached superiorly to spine of sphenoid ( पक्षाभ के कंटक से जुड़ता हैं )
- Inferiorly to lingula of mandibular foramen ( नीचे में अधःहनु छिद्र से जुड़ता है )
- Remnant of meckels cartilage
- Relations. ( संबंध )
- Stylomandibular ligament ( शरहनु स्नायूबंधन )
- Accesory ligament of the joint
- Thickened part of deep cervical fascia
- Separates parotid and submandibular salivary glands
- Attached above to lateral surface of styloid process
- Below to angle and adjacent part of posterior border of ramus of mandible
- ARTICULAR DISC ( संधायक चाप )
- oval fibrous plate ( तंतुमय पत्तल )
- Upper compartment ( ऊपरी भाग )
- Gliding ( फिसलन )
- Lower compartment ( निचला भाग )
- Rotatory and gliding ( घूर्णन और फिसलन )
- Surface ( स्तर )
- Concavo convex superior surface
- Concave inferior surface
- Attachment( जुड़ाव )
- Periphery attached to fibrous capsule
- Disc ( चाप )
- Anterior extension ( अग्र विस्तार )
- Anterior thick band ( अग्र गाढ़ा पट्टी )
- Intermediate zone ( मध्य क्षेत्र )
- Posterior thick band ( पश्च गाढ़ पट्टी )
- Bilaminar region
- Represents degenerated primitive insertion of lateral pterygoid
- Function
- Prevents friction between articulating surface
- Acts as a cushion , helps in shock absorption
- Stabilises condyle by filling up space between articulating surface
- RELATIONS OF TMJ ( संबंध )
- Lateral ( पार्श्वीक )
- Medial ( मध्यवर्ती )
- Tympanic plate separates the joint from internal carotid artery (
- Spine of sphenoid with upper end of sphenomandibular ligament
- Auriculotemporal and chorda tympani nerves
- Middle meningeal artery ( मध्य तानिक धमनी )
- Anterior ( अग्र )
- Lateral pterygoid
- Masseteric nerve and artery
- Posterior
- Superior ( अधि )
- Middle cranial fossa ( मध्य कपाल खात )
- Middle meningeal vessels
- Inferior ( अधः )
- Maxillary artery ( अधःहनु धमनी )
- Maxillary vein ( अधःहनु शिरा )
- BLOOD SUPPLY
- NERVE SUPPLY
- MOVEMENTS
- depression ( open mouth )
- Protrusion ( protraction of chin )
- Retrusion ( retraction of chin )
- Lateral or side to side movements ( chewing or grinding )
Discussion