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MGA > Infratemporal Fossa > Flashcards

Infratemporal Fossa Flashcards

1
Q

what is the door between the middle cranial fossa and the infratemporal fossa?

A

foramen ovale

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2
Q

what foramen does the opthalmic branch of the trigeminal nerve pass through?

A

superior orbital fissure

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3
Q

what foramen does the maxillary branch of the trigeminal nerve pass through?

A

foramen rotundum

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4
Q

what foramen does the mandibular branch of the trigeminal nerve pass through?

A

foramen ovale

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5
Q

what supplies sensory to the forehead, upper eyelids, and bridge of nose?

A

V1

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6
Q

what supplies sensory info to above the cheekbones, upper lip, lower eyelids and side of nose?

A

V2

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7
Q

what supplies sensory info to the lower lip and strip of skin around the jaw line and before the ear?

A

V3

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8
Q

what is the ceiling of the maxillary sinus?

A

the floor of the orbit

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9
Q

what is the floor of the orbit?

A

the ceiling of the maxillary sinus

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10
Q

where does V1 extend into?

A

orbit

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11
Q

where does V2 extend?

A

pterygopalatine fossa

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12
Q

where does V3 extend?

A

infratemporal fossa

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13
Q

anterior wall of infratemporal fossa

A

infratemporal surface of the maxilla

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14
Q

ceiling of the infratemporal fossa

A

laterally: temporalis muscle
medially: greater wing of sphenoid

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15
Q

medial wall of infratemporal fossa

A

lateral pterygoid plate

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16
Q

lateral wall of the infratemporal fossa?

A

ramus of mandible

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17
Q

posterior wall and floor of infratemporal fossa?

A

both open

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18
Q

what is the opening between infratemporal fossa and pterygopalatine fossa?

A

pterygomaxillary fissure on medial wall

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19
Q

contents of the infratemporal fossa

A
  1. temporalis muscle
  2. medial pterygoid muscle
  3. lateral pterygoid mucle
  4. V3 mandibular nerve branches
  5. maxillary artery and its branches
  6. sphenomandibular ligament
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20
Q

sensory branches of the mandibular nerve

A
  1. auriculotemporal
  2. buccal
  3. inferior alveolar
  4. lingual
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21
Q

motor branches of the mandibular nerve

A
  1. nerve to temporalis
  2. nerve to lateral pterygoid
  3. nerve to medial pterygoid
  4. nerve to mylohyoid
22
Q

describe the route of the auriculotemporal nerve

A

splits around the middle meningeal artery, runs with superficial temporal artery laterally toward the parotid and ear, then makes a 90degree turn to run up in front of the ear

23
Q

what does the nerve to mylohoid innervate?

A

comes from inferior alveolar – mylohyoid muscle and the anterior belly of the digastric

24
Q

describe the path of the inferior alveolar nerve

A

once splits from lingual nerve, dives into the mandible to the lower teeth (sensory). continues along the mandible to exit through the mental foramen, becoming the mental nerve to do sensory to the chin.

25
Q

what does the auriculotemporal nerve innervate?

A

skin around the ear, 2 branches course around the middle meningeal artery and then runs with superficial temporal arteries

26
Q

what does the lingual nerve innervate?

A

anterior 2/3 tongue general sensory, joined by chorda tympani which does taste to anterior 2/3 and secretomotor to sublingual and submandibular glands.

27
Q

what does the inferior alveolar nerve innervate?

A

enters mandibular foramen on the inner surface of the mandible. in mandibular canal = sensory for mandibular teeth. at mental foramen, becomes mental nerve and provides sensory innervation to chin

28
Q

what does the mylohyoid branch of the inferior alvelolar nerve innervate?

A

passes along inner surface of the mandible below the mylohyoid line/groove, provides motor fibers to mylohyoid muscle and anterior belly of the digastric

29
Q

what ligament runs through the middle of the infratemporal fossa?

A

sphenomandibular ligament

30
Q

muscles of mastication \

A
  1. temporalis
  2. masseter
  3. medial pterygoid
  4. lateral pterygoid
31
Q

insertion of temporalis muscle

A

coronoid process, down along anterior surface of mandible, and anterior border of ramus as far anteriorly as 3rd molar.

32
Q

origin of temporalis muscle

A

temporal fossa

33
Q

action of temporalis

A

primarily elevator of mandible, but can also retract mandible d/t posterior and middle portions of the muscle

34
Q

which is the only muscle of mastication that lies OUTSIDE of the infratemporal fossa?

A

masseter

35
Q

origin of masseter

A

zygomatic arch

36
Q

insertion of masseter

A

lateral surface of mandible

37
Q

action of masseter

A

POWERFUL elevator of jaw, deeper fibers retract mandible

38
Q

origin of medial pterygoid

A

pyramidal process of palatine bone in pterygoid fossa and the medial surface of the lateral pterygoid plate

39
Q

where is the bulk of the medial pterygoid muscle?

A

behind the lateral pterygoid muscle

40
Q

insertion of the medial pterygoid

A

is directed inferiorly, posteriorly, and laterally to insert on medial surface of the ramus of mandible (kind of diagonal when looking from side)

41
Q

action of medial pterygoid

A

“an internal masseter” – elevator of mandible

42
Q

what muscles form the “mandibular sling”?

A

masseter and medial pterygoid muscles

43
Q

where does the superior (smaller) head of the lateral pterygoid originate?

A

infratemporal region of the greater wing of the sphenoid bone as far laterally as the infratemporal crest

44
Q

where does the inferior (larger) head of the lateral pterygoid muscle originate?

A

lateral surface of the lateral pterygoid plate

45
Q

insertion of the superior head of lateral pterygoid muscle

A

fibers travel posteriorly and laterally (almost horizontally) from the intratemporal crest to the articular capsule of the temporomandibular joint, the anterior border of the articular disk, and superior part of the mandibular neck

46
Q

direction of the inferior lateral pterygoid muscle

A

directed posteriorly, laterally and slightly superiorly to the mandible

47
Q

action of the lateral pterygoid

A

bilaterally: protrudes mandible
unilaterally: slides jaw from side to side

48
Q

why is the lateral pterygoid unique?

A

superior head: insertion into articular disk and capsule stabilizes the mandibular condyle

inferior head: pulls mandible and disk forward and down, opening the jaw

49
Q

what would indicate damage to V3 nerve?

A

if patient protrudes jaw and it deviates to one side, the V3 nerve is damaged on the side that the jaw deviates toward. V3 innervates medial and lateral pterygoid muscles.

50
Q
A
51
Q
A

MGA (27 decks)

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