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BIOS1163 > TMJ and Face Muscles > Flashcards

TMJ and Face Muscles Flashcards

(46 cards)

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1
Q

TMJ movements?

A
  • depression (of mandible)
  • elevation (of mandible)
  • protraction (protusion)
  • retraction (restrusion)
  • lateral
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2
Q

depression of mandible

A

opening jaw

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3
Q

elevation of mandible

A

closing jaw

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4
Q

Protraction (protrusion)

A

pushing mandible forwards

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5
Q

Retraction (retrusion)

A

pulling mandible backwards)

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6
Q

Lateral

A

side to side movements

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7
Q

muscles involved in smiling?

A
  • zygomaticus major and minor (4)
  • Orbicularis oculi (2)
  • Levator labii superioris (2)
  • Levator anguli oris (2)
  • Risoris (2)
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8
Q

zygomaticus major/minor

A

the smiling muscle.

- raises the mouth upward and outward – smiling, laughing

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9
Q

Orbicularis oculi

A

the squinting muscle.

-closes the eyelids, compresses the eye opening, encircles the eye – close, wink, tired.

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10
Q

Levator anguli oris

A

elevates the angles of the mouth at each corner

rasises the corners of the mouth

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11
Q

Risorius

A

the lower lip stretching muscle

- draws the lower lip down and outward – neck muscle – crying, terrified.

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12
Q

Masseter

A

the clenching muscle.

  • used to clench teeth and with lower jaw – fear, yawn
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13
Q

Levator labii superioris

A

– the sneering muscle.

- raises the upper lip beneath the nostrils – disgust, disdain.

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14
Q

Triangularis

A

– the facial shrug muscle.

-pulls the corner of the mouth downward – sadness, crying, miserable

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15
Q

Depressor labii inferioris

A

– the lower lip curl muscle.

-pulls the lower lip down and out – around the lips – surprise

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16
Q

Mentalis

A

– the pouting muscle.

  • raises and tightens the chin - sadness, fear
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17
Q

Orbicularis oris

A

– the lip tightener muscle.

- compress and purses the lips – circles the mouth – disdain, repulsion

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18
Q

Corrugator

A

– the frown muscle.

- compresses the skin between the eyebrows – frown, concern, concentration

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19
Q

Frontalis

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A

– the brow lifting muscle.

- draws the scalp down, wrinkles, two sides – fear, smile.

20
Q

Risorius/platysma

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A

– the lower lip stretching muscle.

- draw the lower lip down and outward – neck muscle – crying, terrified.

21
Q

facial nerves innervation

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A

Muscles of Mastication
V (mandibular branch of trigeminal nerve) – motor and
sensory roles
• Muscles of facial expression
VII (facial nerve)
• Facial/skull sensory supply by cervical nerves

22
Q

what are the muscles of mastication?

Study These Flashcards
A
  • temporalis
  • masseter
  • medial and lateral pterygoid
23
Q

temporalis

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A

actions on mandible:

  • elevate and retract–>posterior, middle, anterior
    attachments: temporal fossa to the coronoid process of the mandible
24
Q

masseter

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A

actions on mandible:

  • elevate (superior superficial+deep)
  • retract (deep)

attachments:

superficial: maxillary process of zygomatic bone to ramus of mandible
deep: zygomatic arch of temporal bone to ramus of mandible

25
lateral pterygoid
actions on mandible: protrusion/depression attachments: disk at the superior head: greater wing of sphenoid to neck of mandible -inferior head: lateral pterygoid plate of sphenoid to neck of mandible
26
medial pterygoid
* more vertical than the horizontal (lateral pterygoid) - actions on mandible: elevate/protrude (jaw closing muscle) attachments - superficial head: maxilla to internal surface of angle of mandible - deep head: lateral pterygoid plate of sphenoid to internal mandible angle
27
what is the innervation for muscles of mastication?
innervated by the mandibular branch of trigeminal nerve CN V (jaw muscles)
28
what is the innervation for muscles of facial expression?
VII (facial nerve)
29
what does the TMJ allow movement for?
allows movement of the mandible (lower jaw) relative to the movement of the maxilla (upper jaw)
30
what are the articular surfaces of the TMJ
temporal bone: articular tubercle and mandibular fossa | mandible: condylar process (head)
31
TMJ position of rest?
3-4mm teeth separation
32
TMJ range of motion
40-50mm (3 fingers)
33
what happens when the jaw opens/closes?
no muscle contractions -->muscles relaxed | jaw closed -->muscles contracted
34
TMJ joint
synovial biaxial condylar joint - loose but strong joint capsule - attaches to margins of mandibular fossa on the temporal bone and the neck of the condylar process (of mandible)
35
TMJ joint is divided by?
an articular disc with 2 synovial membranes lining each cavity
36
TMJ articular disc
- wedge of fibrocartilage (not squishy but cushions joint) - divides TMJ into superior and inferior compartments - increases range of motion, congruency, absorbs shock - concavoconvex shape to create better fit
37
what are the attachments of the TMJ articular disc?
``` lateral pterygoid (anteriorly) head of mandible (anteriorly) joint capsule (circumferentially) ```
38
TMJ ligaments
lateral TMJ ligament -->stretches TMJ joint capsule laterally -->prvents inferoposterior condylar displacement stylomabindobular/sphenomandibular ligament --> accessory ligaments --> prevents excessive mandibular opening
39
what are the movements withing the TMJ
first stage: rotation | second stage: translation movement
40
first stage movement TMJ
hinge like rotation of mandibular condyle pm disc inferior compartment -the articular disc and mandible move together
41
second stage movement of TMJ
anterior gliding of mandibular condyle and disc onto articular tubercle within fossa -lateral pterygoid inserts into mandibular head and articular disc -->both pulled onto the articular tubercle
42
resting position of TMJ
- open packed jaw position, connective tissue loose - medial/lateral pterygoid musles relaxed - teeth not in contact, mouth slightly open
43
rotation of TMJ --> first half of mouth opening
condylar process rolls anteriorly eccentric contraction of temporalis -inferior lateral ptergyoid tenses, superior relaxed
44
TMJ Translation -->second half of mouth opening
dislocation can occur -disc and condylar process glide anteriorly superior/inferior lateral pterygoid contract connective tissue is taught posteriorly
45
TMJ closure
disc and condylar process glide posteriorly | connective tissue returns to rest
46
stability at the TMJ
- mandible position most stable -->maximum congruency - disc shape and attachments --> strongle attached, allows rotation/sliding movements - lateral ligament prevents dislocation - temporalis and lateral pterygoid muscles provide dynamic stability

BIOS1163 (13 decks)

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