TMJ
thyroid cartilage
-"adam's apple" -inferior to hyoid bone -provides attachment for infrahyoid muscles
joint capsule
-envelopes TMJ
hyoid bone
-horse shoe shaped bone laying superior to thyroid cartilage around C3 -provides attachment for tongue muscles, suprahyoid & infrahyoid muscles
stylohyoid ligament
-ligament -from styloid process of temporal bone to hyoid bone -holds hyoid bone in place
lateral ligament
-ligament -mandibular condyle to tubercle of temporal bone -limits downward, posterior, and lateral motions of mandible
sphenomandibular ligament
-ligament -spine of sphenoid bone to anterior ramus of mandible -suspends mandible & limits excessive anterior motion
stylomandibular ligament
-ligament -styloid process of temporal bone to posterior ramus of mandible -limits excessive anterior motion
clenched teeth
TMJ's close-packed position
temporal
TMJ's concave surface
mandible
TMJ's convex surface
mouth slightly opened
TMJ's loose-packed position
elevation
closing the mouth
bony
end feel for TMJ elevation
soft tissue stretch
end feel for all TMJ motions (except elevation)
3
how many degrees of freedom does TMJ have
bilaterally: depression protrusion unilateraly: contralateral lateral deviation
lateral pterygoid muscle actions
mandibular condyle & articular disk
lateral pterygoid muscle insertion
trigeminal nerve (cranial nerve V)
lateral pterygoid muscle nerve
lateral pterygoid plate & greater wing of sphenoid
lateral pterygoid muscle origin
bilaterally: elevation unilaterally: ipsilateral lateral deviation
masseter muscle actions
angle of the ramus & coronoid process of mandible
masseter muscle insertion
trigeminal nerve (cranial nerve V)
masseter muscle nerve
zygomatic arch of temporal bone & zygomatic process of maxilla
masseter muscle origin
bilaterally: elevation protrusion unilaterally: contralateral lateral deviation
medial pterygoid muscle actions
ramus & angle of the mandible
medial pterygoid muscle insertion
trigeminal nerve (cranial nerve V)
medial pterygoid muscle nerve
lateral pterygoid plate of the sphenoid bone & the tuberosity of the maxilla
medial pterygoid muscle origin
protraction/retraction elevation/depression lateral deviation
motions of the TMJ (3)
protrusion (protraction)
moving jaw forward
retrusion (retraction)
moving jaw posteriorly
masseter & temporalis
muscles of mandibular elevation (2)
masseter & temporalis
muscles that cause ipsilateral deviation (2)
depression
opening the mouth
lateral deviation
side-to-side jaw movements
bilaterally: elevation retrusion unilaterally: ipsilateral deviation
temporalis muscle actions
coronoid process & ramus of mandible
temporalis muscle insertion
trigeminal nerve (cranial nerve V)
temporalis muscle nerve
temporal fossa
temporalis muscle origin
lateral pterygoid
the muscle that has attachments to the articular disk
roll, glide, spin
types of movement of the mandible on the temporal bone (3)
elevation & protrusion
what motions of the TMJ will be absent if cranial nerve V is severed
buccinator
what muscle lies deep to the masseter muscle
synovial, hingelike
what type of joint is the TMJ