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Gross Anatomy Exam 2 > Infratemporal Region, TMJ, MOM, and V3 > Flashcards

Infratemporal Region, TMJ, MOM, and V3 Flashcards

1
Q

O/I of temporalis

A

O: temporal lines
I: coronoid process

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2
Q

Action of temporalis

A

elevates and retracts the mandible

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3
Q

O/I of Masseter

A

O: Zygomatic arch
I: gonial angle (ramus of mandible)

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4
Q

Action of masseter

A

elevates the mandible and some protrusion

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5
Q

O/I of lateral pterygoid

A

O: lateral aspect of the pterygoid plate
I: TMJ joint capsule, disc, and mandibular neck (of the condyle)

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6
Q

Bilateral and unilateral action of the lateral pterygoid

A

bilateral: protrudes and depresses the mandible
unilateral: contralateral deviation (latrotrusive movement)

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7
Q

Medial pterygoid O/I

A

O: medial aspect of the lateral pterygoid plate
I: gonial angle of the mandible (the ramus-forms the sling here with the masseter)

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8
Q

Medial pterygoid action

A

elevates and protrudes the mandible

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9
Q

The only muscle of the face to depress the mandible

A

lateral pterygoid

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10
Q

to move the jaw to one side what muscles contract

A

the opposite side lateral and medial pterygoids

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11
Q

Nerve innervating the temporalis

A

deep temporal

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12
Q

n. to the masseter

A

masseteric

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13
Q

n. to the lateral pterygoid

A

lateral pterygoid

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14
Q

n. to the medial pterygoid

A

medial pterygoid

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15
Q

The TMJ joint itself has two components

A

the mandibular fossa (glenoid fossa) of the temporal bone and the condyle of the mandible

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16
Q

Bones of the TMJ

A

Temporal and mandible

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17
Q

TMJ ligaments include

A 
4 of them.. they are the 
joint capsule
lateral TMJ ligament
sphenomandibular ligament
stylomandibular ligament
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18
Q

What separates the TMJ into inf and sup cavities?

A

the articular disc

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19
Q

Tubercles of the TMJ include (2)

Where is each in reference to the other?

A

the articular tubercle which is ant and the postglenoid tubercle which is post

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20
Q

How many orthogonal planes can the mandible be moved in?

A

3..

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21
Q

The 3 planes in which the mandible can be moved in

*Bonus if you can say what movement causes each

A

sagittal-protrusion and retrusion
coronal-elevation and depression
transverse-lateral excursion

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22
Q

rate of muscle contraction to perform movements of the mandible

A

rapid and well coordinated

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23
Q

activation of the left lateral pterygoid causes what action

A

right opening

24
Q

activation of the right masseter and the left medial pterygoid causes which action

A

closing to the right

25
Q

activation of the masseter and medial pterygoids causes what action

A

closing and protrusion

26
Q

activation of the inf head of the lateral pterygoid

A

opening and protrusion

27
Q

activation of the digastric, geniohyoid, mylohyoid (and lateral pterygoid)

A

opening of the mouth (depression of the mandible)

28
Q

activation of the masseter, temporalis (ant. and middle) and the medial pterygoid

A

elevation of the mandible (closing)

29
Q

activation of the post temporalis

A

retraction

30
Q

how can the co-contraction of the left medial pterygoid and the right masseter cause movement of the mandible to the right?

A

the constituent Force vectors of each muscle are directed both sup. and to the right (medially for the pterygoid and lat for the masseter)
I always hated physics…

31
Q

Only muscle capable of retruding the mandible (according to Kirchoff)

A

the post. part of the temporalis, do not be confused though… in Dental Anatomy we said that only the sup. part of the retrodiscal ligament (I believe) retracts the mandible

32
Q

How can part of the temporalis be involved in retracting the mandible

A

the post most fibers have an origin post to the TMJ and are the only muscle fibers which have such an origin

33
Q

during rest, where are each of the condyles

A

at rest, symmetrically, in their glenoid fossas

34
Q

during the start of jaw opening, which (2) muscles will contract to move the mandible anteriorly and to the left (the working side aka laterotrusive movement)

A

the right inferior head of the lateral pterygoid in conjunction with the suprahyoid muscles (the infrahyoid’s probably assist here too but are not mentioned)

35
Q

During closing movement, which (2) muscles move the mandible to the right during the power stroke (crushing the food)

A

The left medial pterygoid

36
Q

After a power stroke, what happens to the mandible and which muscles are involved in this movement

A

the posterior fibers of the temporalis (according to Kirchoff) retrude the mandible in order to bring the balancing side condyle back into the mandibular fossa

37
Q

Explain one full cycle of chewing (movements of the mandible and the general muscles involved)

*long response

A

The mandible begins by opening (depressing) and moving ant.; these actions are caused by the opposite side (mediotrusive or non-working side) inferior head of the lateral pterygoid as well as the suprahyoid..

The mandible then closes (power stroke) which is caused by the same side masseter and the opposite side medial pterygoid.

Lastly, the post fibers of the temporalis will work to retrude the mandible, fixing the condyles back in their fossae for the next cycle.

38
Q

protrusion during elevation is caused by which muscles

A

masseter and medial pterygoid (bilateral)

39
Q

what is the prime mover of depression

A

Gravity, against resistance the lateral pterygoid and the suprahyoids assist

40
Q

muscles which elevate the mandible

A

masseter, temporalis, medial pterygoid

41
Q

where does the pterygoid venous plexus receive blood from (2)

A

receives blood from veins that accompany the maxillary artery and from the cavernous sinus via emissary veins

42
Q

where does the pterygoid plexus drain

A

via the deep facial vein

43
Q

Location of the otic ganglion

A

medial to CNV

44
Q

What synapses at the otic ganglion

A

parasympathetic fibers from CN 9 (think COPS 3977) headed to the parotid gland

45
Q

how do parasympathetic fibers from CN9 get to the parotid gland

A

they hop on the auriculotemporal n. (CN V3)

46
Q

General sensory branches of V3 (6)

A

Meningeal
Buccal (long)
Auriculotemporal

Lingual
Inferior Alveolar
Mental

MBA LIM

47
Q

Motor innervation of CNV3 (4)

A

Muscles of mastication
Nerve to mylohyoid

The two tensors…
tensor veli palatini
tensor tympani

48
Q

Where does CNV3 exit the skull

A

foramen ovale

49
Q

Where does the inf alveolar branch of CNV3 enter and exit the face

A

it enters the mandibular foramen (think post mandible) and exits via the mental foramen (of the ant mandible)

50
Q

General sensory sensations done by CNV3

5ish

A

Lateral face, chin, lower lip
ant 2/3 of the tongue via the lingual nerve (NOT taste) Dura mater in the middle
Cranial Fossa
TMJ via the auriculotemporal

51
Q

Ant. 2/3 of the tongue taste (be specific)

A

CNVII via chorda tympani

52
Q

Ant. 2/3 of the tongue sensation (CN and branch)

A

CN V3, the lingual branch of V3

53
Q

Track the pathway of chorda tympani

A

From CNVII it runs ant where it joins with the lingual nerve of CNV3 to the submandibular/sublingual ganglion and the tongue

54
Q

where does chorda tympani join the lingual nerve (branch of V3)

A

the infratemporal fossa

55
Q

Which nerve largely does general sensation to the TMJ

A

auriculotemporal branch of CNV3

56
Q

the deep temporal nerves pass into which muscle and from which direction

A

the temporalis m. and medially

57
Q

the nerve to mylohyoid innervates what (2)

A

mylohyoid

ant. belly of the digastric m.

Gross Anatomy Exam 2 (2 decks)

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