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lateral ligament aka TJM lig - it's formed by the intrinsic thick part of the articular capsule. Describe the 2 parts
- outer oblique: attaches to neck of condyle
- inner oblique: attaches to lateral pole of conyle and post disc (w postglenoid tubercle it acts to prevent post dislocation of the jt)
stylomandibular lig -- attachments
from styloid process of temporal bone to angle of mandible
(it's debated whether it pulls disc on closure of jaw)
styolomandibular lig - describe it
- thickening of fibrous capsule of parotid gland
- inserts btwn masseter and medial pterygoid
stylomandibular lig -- limits what?
sphenomandibular lig - attachments
spine of sphenoid to lingula of mandible
the lingula is on the medial surface of the mandible, inf to the pterygoid fossa
which lig is the primary support of the mandible?
- sphenomandibular lig
- serves as a swinging hinge for mandible
- it's taut w mod opening, hurts most after a long dental appt.
collateral discal ligaments attachments?
- med and lat aspect of disc to med and lat poles of condyle
- permits ant/post rot on the condyle
anteriorly, disc is attached to what?
capsule and tendon of lat pterygoid
bilaminar retrodiscal pad
- the fibroelastic tissue on post aspect of disc -- attaches to squamous part of temporal bone
- top band is elastic -- it pulls the disc back
- lower band is not elastic, more like a tether - prevents disc from going further than it should
what innervates the TMJ?
- trigeminal nerve
- branches of the auriculotemporal and masseteric branches of the mandibular nerve
3 muscles that help with depression (though gravity is the prime mover)
- supra and infrahyoid muscles
- lateral pterygoid, lower portion
muscles of elevation/closing
- medial pterygoid
- medial/sup portion of lateral pterygoid
masseter attachments and action
- zygomatic arch --> mandibular angle
- elevate and protrude mandible
temporalis attachments and action
- temporal fossa of temporal bone --> coronoid process of mandible (apex and medial surface)
- elevate, retract, lateral movement
lateral pterygoid attachments
- sup: greater wing of sphenoid --> TMJ/disc
- inf: lat pherygoid plate --> condylar process of mandible
they run almost horiz, though the sup is kind of inferolat, going to the condyle/disc
lateral pterygoid action
- bilat: protrude
- unilat: lateral movements for chewing
medial pterygoid attachments
- sup: maxilla
- deep: medial surface of lateral pterygoid plate and pterygoid fossa (on the sphenoid)
--> pterygoid tuberosity on medical surface of mandibular angle
they run inferolat, with the sup head being thinner and more ant
action of the medial pterygoid