- bony surfaces temporal fossa - inf temporal line

- powerful elevator of mandible - retraction - assists w side to side movement

Temporomandibular joint (TMJ) Flashcards by Irene Xiao

temporomandibular joint: articulation btw

temporal bone:

articular process
mandibular fossa

mandible:
- condyloid process

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TMJ joint: classify

synovial modified hinge

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TMJ joint: function

chewing
talking
yawning

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TMJ joint: consists of

fibrous capsule
ligs
articular surface + disc
muscles

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TMJ joint: articular capsule + disc

loose
margins of articular area of temporal bone
neck of mandible

disc:

separates into sup/ inf compartments
compartments of synovial membrane

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TMJ joint: name ligs and function

lateral: (strengthens TMJ)
stylomandibular lig (minimal support to joint)
sphenomandibular lig (passive support to mandible)

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TMJ joint: which lig prevents post dislocation

lateral lig

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lateral lig: from

reinforces around TMJ capsule in mandible

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stylomandibular lig: from

styloid process to angle of mandible

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sphenomandibular lig: from

sphenoid spine to lingula of mandibular foramen

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TMJ joint: list movements

elevation
depression
retraction
protrusion
lateral deviation (L, R)

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TMJ joint: describe movement

each condyle first rotates within disc
both condyle and disc slide forward down articular eminence
for jaw close: move in unison back into mandibular fossa

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mm involved in: protrusion

lateral pterygoid (assisted by medial pterygoid)

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mm involved in: retraction

post fibres of temporalis,

- deep part of masseter, glenohyoid and digastric

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mm involved in: elevation

temporalis
masseter
medial pterygoid

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mm involved in: depression

gravity

- digastric, glenohyoid, mylohyoid

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mm involved in: mastication

masseter
temporalis
lateral pterygoid
medial pterygoid

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mm involved in: suprahyoids

mylohyoid
geniohyoid
stylohyoid
digastric

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mm involved in: infrahyoids

sternohyoid
omohyoid
sternothyroid
thyrohyoid

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temporalis: origin

bony surfaces temporal fossa

- inf temporal line

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temporalis: insertion

coronoid process

- ant margin or ramus and mandible

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temporalis: action

vertical fibres:
- elevation, side to side

horizontal fibres:
- retraction

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temporalis: function

powerful elevator of mandible
retraction
assists w side to side movement

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temporalis: shape

fan shape

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masseter: shape

- quadrangular

superficial part -masseter: origin

- maxillary process of zygomatic | - ant 2/3 zygomatic process maxilla

superficial part -masseter: insertion

- lateral aspect of ramus of mandible

superficial part -masseter: action

elevation

deep part -masseter: origin

- medial aspect of zygomatic arch | - post part of its inf margin

deep part -masseter: insertion

- central and upper part of ramus of mandible | - as high as coronoid process

deep part -masseter: action

elevation

deep head - medial pterygoid: shape

quadrangular

deep head - medial pterygoid: origin

- medial surface of lateral pterygoid plate/ process

deep head - medial pterygoid: insertion

- fibres pass down lateral | - post to common tendinous sling on medial side of ramus of mandible

deep head - medial pterygoid: action

elevation assists lateral pterygoid in protrusion

medial head - medial pterygoid: shape

quadrangular

deep head - medial pterygoid: origin

maxillary process and pyramidal process of palatine bone

deep head - medial pterygoid: insertion

- fibres pass down lateral, post to common tendinous sling on medial side of ramus of mandible

deep head - medial pterygoid: actino

elevation assists lateral pterygoid in protrusion

sup head - lateral pterygoid: shape

triangular

sup head - lateral pterygoid: origin

- infratemporal surface | - infratemporal crest of greater wing of sphenoid

sup head - lateral pterygoid: insertion

- articular disc and fibrous capsule

sup head - lateral pterygoid: action

protrusion coordinated movement of TMJ result in chewing

inf head - lateral pterygoid: shape

triangular

inf head - lateral pterygoid: origin

- lateral surface of lateral pterygoid plate/ process

inf head - lateral pterygoid: insertion

neck of mandible

inf head - lateral pterygoid: action

protrusion coordinated movement of TMJ result in chewing

innervation: masseter

trigeminal (CN V) mandibular division | - masseteric branch

innervation: temporalis

CN V mandibular div - deep temporal nerves

innervation: medial pterygoid

CN V mandibular div - medial pterygoid n

innervation: lateral pterygoid

CN V mandibular div - lateral pterygoid n

suprahyoid and infrahyoid mm: function

- primarily used to raise/ depress hyoid bone and larynx | - indirectly help depress mandible: suddenly/ against resistance

stylohyoid: origin

styloid process of temporal bone

stylohyoid: insertion

body of hyoid

stylohyoid: inn

facial (CN VII)

mylohyoid: origin

mylohyoid line on mandible

mylohyoid: insertion

body of hyoid, median raphe

mylohyoid: inn

n to mylohyoid from mandibular div of CN V

geniohyoid: origin

inf mental spine of mandible

geniohyoid: insertion

body of hyoid

geniohyoid: inn

ant rami of C1

diagastric: origin - ant belly

diagastric fossa of mandible

diagastric: origin - post belly

mastoid process of temporal bone

diagastric: insertion

intermediate tendon (body of hyoid)

diagastric: inn

CN VII

TMJ: innervation branch

auriculotemporal n. from mandibular branch of trigeminal

TMJ: auriculotemporal provides

- general sensory fibres from skin over large area of temple - external ear - tympanic membrane - TMJ - delivers postganglionic parasymp fibres to parotid gland

TMJ: signs and symptoms associated

- pain travelling through face/ jaw/ neck - stiff jaw mm - limited movement/ locking of jaw - painful clicking/ popping of jaw - change in position of sup/ inf teeth

TMJ: palpation

- intraoral (in mouth)/ TMJ palpation | - intra auricular

eg. Bruxism:

- nocturnal grinding of teeth | - causes inflammation/ pain

eg. ant disc displacement without reduction

- lock jaw decreased ROM - ligs stretch, disc sits ant and doesn't reduce back into mandibular fossa - difficulty opening mouth more than 2 finger width

TMJ: dislocation

ant: - large bites, excessive contraction of lateral pterygoid mm post: - uncommon due to protection of lateral lig

TMJ: stylomandibular lig sprain

- sharp to aching pain behind lower jaw and below ear | - bad bite or trauma

TMJ: arthritis features

- systemic disease like rheumatoid arthritis | - excessive use of TMJ

TMJ: arthritis symptoms

- crepitus (grating sound) - pain around ear - bit shift and decreased ROM - inability to chew

Temporomandibular joint (TMJ) Flashcards

(75 cards)