Infratemporal Fossa

Question 1

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

Answer 1

foramen ovale

Question 2

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

Answer 2

superior orbital fissure

Question 3

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

Answer 3

foramen rotundum

Question 4

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

Answer 4

foramen ovale

Question 5

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

Answer 5

V1

Question 6

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

Answer 6

V2

Question 7

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

Answer 7

V3

Question 8

what is the ceiling of the maxillary sinus?

Answer 8

the floor of the orbit

Question 9

what is the floor of the orbit?

Answer 9

the ceiling of the maxillary sinus

Question 10

where does V1 extend into?

Answer 10

orbit

Question 11

where does V2 extend?

Answer 11

pterygopalatine fossa

Question 12

where does V3 extend?

Answer 12

infratemporal fossa

Question 13

anterior wall of infratemporal fossa

Answer 13

infratemporal surface of the maxilla

Question 14

ceiling of the infratemporal fossa

Answer 14

laterally: temporalis muscle
medially: greater wing of sphenoid

Question 15

medial wall of infratemporal fossa

Answer 15

lateral pterygoid plate

Question 16

lateral wall of the infratemporal fossa?

Answer 16

ramus of mandible

Question 17

posterior wall and floor of infratemporal fossa?

Answer 17

both open

Question 18

what is the opening between infratemporal fossa and pterygopalatine fossa?

Answer 18

pterygomaxillary fissure on medial wall

Question 19

contents of the infratemporal fossa

Answer 19

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

Question 20

sensory branches of the mandibular nerve

Answer 20

1. auriculotemporal
2. buccal
3. inferior alveolar
4. lingual

Question 21

motor branches of the mandibular nerve

Answer 21

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

Question 22

describe the route of the auriculotemporal nerve

Answer 22

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

Question 23

what does the nerve to mylohoid innervate?

Answer 23

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

Question 24

describe the path of the inferior alveolar nerve

Answer 24

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.

Question 25

what does the auriculotemporal nerve innervate?

Answer 25

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

Question 26

what does the lingual nerve innervate?

Answer 26

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

Question 27

what does the inferior alveolar nerve innervate?

Answer 27

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

Question 28

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

Answer 28

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

Question 29

what ligament runs through the middle of the infratemporal fossa?

Answer 29

sphenomandibular ligament

Question 30

muscles of mastication \

Answer 30

1. temporalis 2. masseter 3. medial pterygoid 4. lateral pterygoid

Question 31

insertion of temporalis muscle

Answer 31

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

Question 32

origin of temporalis muscle

Answer 32

temporal fossa

Question 33

action of temporalis

Answer 33

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

Question 34

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

Answer 34

masseter

Question 35

origin of masseter

Answer 35

zygomatic arch

Question 36

insertion of masseter

Answer 36

lateral surface of mandible

Question 37

action of masseter

Answer 37

POWERFUL elevator of jaw, deeper fibers retract mandible

Question 38

origin of medial pterygoid

Answer 38

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

Question 39

where is the bulk of the medial pterygoid muscle?

Answer 39

behind the lateral pterygoid muscle

Question 40

insertion of the medial pterygoid

Answer 40

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

Question 41

action of medial pterygoid

Answer 41

"an internal masseter" -- elevator of mandible

Question 42

what muscles form the "mandibular sling"?

Answer 42

masseter and medial pterygoid muscles

Question 43

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

Answer 43

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

Question 44

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

Answer 44

lateral surface of the lateral pterygoid plate

Question 45

insertion of the superior head of lateral pterygoid muscle

Answer 45

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

Question 46

direction of the inferior lateral pterygoid muscle

Answer 46

directed posteriorly, laterally and slightly superiorly to the mandible

Question 47

action of the lateral pterygoid

Answer 47

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

Question 48

why is the lateral pterygoid unique?

Answer 48

superior head: insertion into articular disk and capsule stabilizes the mandibular condyle inferior head: pulls mandible and disk forward and down, opening the jaw

Question 49

what would indicate damage to V3 nerve?

Answer 49

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.