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TMJ

Dental Anatomy DENT-110

QuestionAnswer
temporomandibular ligament reinforces joint capsule, prevents excessive retraction
stylomandibular ligament formed of cervical fascia. seperates the parotid and submandibular salivary glands. Becomes taut when mandible is protruded
sphenomandibular ligament long membranous band that runs from the angular spine of the sphenoid to the lingular, over the mandibular foramen
Inferior alveolar nerve descends between the sphenomandibular ligament and mandibular ramus to gain access to the mandibular foramen
Meckel cartilage embryonic lower jaw that develops into sphenomandibular ligament
Gliding movement protrusion and retraction
rotational movement depression and elevation
Protrusion gliding in upper synovial cavities. Lateral Pterygoid with bilateral contraction
Retraction gliding in upper synovial cavities. Posterior part of temporalis and suprahyoids
Elevation and retraction, closing of the jaws Gilding in upper synovial cavities, rotation in lower synovial cavities. Masseter, Temporalis, medial pterygoid
Depression and protrusion, opening jaws Gliding in upper synovial cavities, rotation in lower synovial cavities, Syprahyoids and lateral pterygoid
Lateral deviation, shifing mandible to one side Gliding in one upper synovial cavity while the condyle and disc of the other side spin vertically within upper synovial cavity. Lateral pterygoid with unilateral contraction
Interocclusal clearance freeway space. Aprox 2-4mm between opposing teeth of each arch
Subluxation head of the condyle moves too far anteriorly on the articular eminence
trismus reduced opening of the jaws
TMD heterogenous group of musculoskeletal and neuromuscular conditions affecting the TMJ. Most are muscular in origin.
Created by: SonyaP
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