TMD anatomy Flashcards
temporomandibular joint
most frequently used joints in the body
Talking, eating, yawning singing
TMJ osseous structures
Condyle of the mandible
mandibular fossa
Articular eminence
Collateral ligaments
medial collateral from disc to medial pole of the condyle
Lateral collateral from disc to lateral pole of the condyle
Stylo mandibular ligament
Primary function to limit excessive protrusion
spheno mandibular ligament
no significant effects on limiting normal mandibular motion
articular disc
dense fibrous tissue
Divides the joint into superior and inferior departments
posterior attach to the temporal bone through a section of the loose retrodiscal tissue
anterior attachment to the capsule and the superior lateral pterygoid muscle
Mandibular opening muscles
inferior lateral pterygoid
Digastric
Secondary-depresses mandible when hyoid is stabilized
-stylohyoid
-geniohyoid
-mylohyoid
mandibular closing muscles
Temporalis
Masseter
Medial pterygoid
mandibular lateral movement muscles
Temporalis (ipsilateral)
Medial and lateral pterygoid (contralateral)
Mandibular protrusion muscles
masseter superficial head
Medial pterygoid
Lateral pterygoid superior head
mandibular retraction muscles
Temporalis
Digastric
Supra hyoid
-stylohyoid
-Geniohyoid
-mylohyoid
innovation of TMJ
Mandibular nerve
Nerve to the mylohyoid
Lingual nerve
Buccal nerve
inferior alveolar
Auriculotemporal
TMJ Arthro kinematics
Rotation- condyle on articular disc
translation - condyle and disk on mandibular fossa
TMJ opening
Rotation-initial phase of opening 20 to 25 mm
Translation - 2nd phase of opening
-condyle moves anterior and inferior
-anterior surface of the mandible moves anteriorly and inferiorly
40-60mm
functional-36-44
closing TMJ
Eccentric contraction anterior- superior lateral pterygoid
Release of passive tension posterior - retrodiscal tissue
