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DDS1-gross anatomy > muscles of mastication > Flashcards

muscles of mastication Flashcards

1
Q

temporalis m origin

A
  • bony surfaces of temporal fossa
  • inferior temporal line
  • overlying temporal fascia
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2
Q

bilateral action of temporalis m

A
  • resting tonus
  • elevate (anterior fibers)
  • retract (posterior fibers)
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3
Q

innerv of temporalis m

A

deep temporal n (branch of mandibular nerve)

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4
Q

blood supply of temporalis m

A
  • deep temporal a

- middle temporal a

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5
Q

most powerful muscle in the body

A

massetor m

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6
Q

what 3 things are superficial to the massetor m

A
  • parotid gland and duct
  • transverse facial a
  • branches of CN 7
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7
Q

origin of superficial head of the massetor m

A
  • maxillary process of zygomatic bone

- inferior aspect of anterior 2/3 of zygomatic arch

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8
Q

origin of deep head of the masseter m

A
  • medial aspect of zygomatic arch

- inferior margin of post 1/3 of zygomatic arch

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9
Q

bilateral action of masseter m (superficial)

A
  • elevate

- protrusion

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10
Q

unilateral action of masseter m

A

lateral movement (ipsilateral)

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11
Q

n and a supply of masseter m

A

masseteric n, masseteric a and transverse facial a

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12
Q

superficial head of medial pterygoid m

A

origin: tuberosity of maxilla + pyramidal process of palatine bone
insertion: pterygoid rugosity of medial aspect of ramus

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13
Q

deep head of medial pterygoid m

A

origin: medial surface of lateral pterygoid plate
insertion: pterygoid rugosity on medial aspect of ramus

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14
Q

action of medial pterygoid m (superficial and deep heads)

A

bilateral: elevate and protrusion
unilateral: lateral movement to the OPPOSITE side**

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15
Q

if the right medial pterygoid m is damaged, what is the resulting action

A

moves to the right

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16
Q

the masseter and medial pterygoid form a

A

muscular sling

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17
Q

innervation of medial pterygoid m

A

nerve to the medial pterygoid

18
Q

the only horizontal m of mastication

A

lateral pterygoid m

19
Q

superior head of lateral pterygoid m ORIGIN

A

roof of IT fossa (inferior aspect of GW of sphenoid and IT crest)

20
Q

inferior head of lateral pterygoid m ORIGIN

A

lateral aspect of lateral pterygoid plate

21
Q

bilateral action of lateral pterygoid (upper)

A
  • elevate
  • protrusion
  • DEPRESSION
22
Q

unilateral action of lateral pterygoid m

A

CONTRALATERAL excursion**

23
Q

bilateral action of lateral pterygoid (lower)

A
  • protrusion
  • DEPRESSION
  • NO elevation
24
Q

which muscles elevate

A
  • temporalis
  • masseter
  • medial pterygoid
  • lateral pterygoid (superior head)
25
Q

which muscles depress the mandible

A
  • lateral pterygoid
  • suprahyoid m (except for stylohyoid m)
  • platysma
26
Q

which muscles protrude

A
  • lateral pterygoid
  • medial pterygoid
  • masseter (superficial)
27
Q

which muscles retrude

A
  • temporalis (posterior)

- masseter (deep)

28
Q

which muscles move to the right

A
  • R temporalis
  • R masseter
  • L medial and lateral pterygoid
29
Q

which muscles move to the left

A
  • L temporalis
  • L masseter
  • R medial and lateral pterygoid
30
Q

temporalis m insertion

A
  • medial aspect of coronoid process

- anterior margin of mandibular ramus

31
Q

unilateral action of temporalis m

A

lateral movement (ipsilateral)

32
Q

insertion of masseter m (superior)

A
  • angle of mandible

- lateral surface of mandibular ramus

33
Q

insertion of masseter m (deep)

A

central and upper part of mandibular ramus

34
Q

bilateral action of masseter muscle (superficial)

A
  • elevate

- protrusion

35
Q

bilateral action of masseter muscle (deep)

A
  • elevate

- RETRACT

36
Q

lateral pterygoid (superior head) INSERTION

A
  • capsule of TMJ
  • articular disc
  • pterygoid fovea (minor)
37
Q

lateral pterygoid m (lower) INSERTION

A
  • pterygoid fovea

- capsule of TMJ (minor)

38
Q

roof of IT fossa

A

GW of sphenoid and inferior portion of temporal bone

39
Q

anterior border of IT fossa

A

tuberosity of maxilla

40
Q

posterior border of IT fossa

A

styloid process and condylar process

41
Q

medial border of IT fossa

A

lateral pterygoid plate of sphenoid bone

42
Q

lateral border of IT fossa

A

medial surface of the mandibular ramus and coronoid process

DDS1-gross anatomy (39 decks)

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