Muscles of Mastication, Infratemporal Fossa, TMJ

Question 1

what are the six components of the temporomandibular joint?

Answer 1

Mandibular fossa
Articular disc
Mandibular condyle
Joint capsule
Inferior joint space
Superior joint space

Question 2

what is the first and second movements of the jaw?

Answer 2

rotation then translation

Question 3

masseter origin and insertion

Answer 3

zygomatic arch
angle and ramus of mandible

Question 4

function of masseter

Answer 4

elevate mandible
(protrusion by superficial head)

Question 5

what does the temporal fossa contain?

Answer 5

temporalis
superficial temporal a.
deep temporal a.

Question 6

temporalis origin and insertion

Answer 6

temporal fossa
coronoid process (mandible)

Question 7

temporalis function

Answer 7

elevate mandible
retrusion of mandible

Question 8

lateral pterygoid origin and insertion

Answer 8

– Origin
* Superior head – greater wing
sphenoid
* Inferior head – lateral wall of lateral
pterygoid plate

– Insertion
* Superior head - articular disk and TMJ
capsule
* Inferior Head - Pterygoid fovea of
condyle

Question 9

lateral pterygoid function

Answer 9

protrusion of mandible

Question 10

medial pterygoid origin and insertion

Answer 10

-Origin:
* Deep Head: Medial surface of lateral
pterygoid plate/pterygoid fossa
* Superficial head: Maxillary tuberosity

-Insertion:
* Medial surface of ramus/angle of mandible

Question 11

medial pterygoid function

Answer 11

elevation of mandible
protrusion of mandible
minor: lateral excursion of mandible

Question 12

muscles of mastication (4)

Answer 12

temporalis
masseter
lateral pterygoid
medial pterygoid

Question 13

movements of the jaw

Answer 13

Question 14

inratemporal fossa is the space below the…

Answer 14

temporal fossa

Question 15

most of the temporalis is in the ____ fossa

Answer 15

temporal

Question 16

masseter is ____ to the infratemporal fossa

Answer 16

external

Question 17

medial pterygoid is ___ to the infratemporal

Answer 17

internal

Question 18

lateral pterygoid is ___ to the infratemporal

Answer 18

internal

Question 19

neurovasculature of the temporalis, masseter, medial/later pterygoids run within what?

Answer 19

infratemporal fossa

Question 20

What arteries are the temporal fossa mostly vascularized by?

Answer 20

superficial temporal a.
anterior deep temporal a.
posterior deep temporal a.

Question 21

what branch of the external carotid a. innervates the infratemporal fossa?

Answer 21

maxillary a.

Question 22

3 anatomic subdivisions of the maxillary a.

Answer 22

1. mandibular
2. pterygoid
3. pterygopalatine

Question 23

mandibular branches: #
pterygoid branches: #
pterygopalatine branches: #

Answer 23

mandibular branches: 4
pterygoid branches: 4
pterygopalatine branches: 5

Question 24

mandibular a. branches

Answer 24

ascending:
*deep auricular a.
*anterior tympanic a.
*middle meningeal a.

descending:
*inferior alveolar a. (mylohyoid a.)

Question 25

deep auricular a. supplies (3)

Answer 25

* TMJ * Tympanic membrane * External acoustic meatus

Question 26

anterior tympanic a. supplies the

Answer 26

middle ear cavity

Question 27

middle meningeal a. supplies the

Answer 27

cranial dura

Question 28

inferior alveolar a. supplies the

Answer 28

teeth gums chin lower lip *ends at mental foramen

Question 29

mental a. anastomosis with what?

Answer 29

inferior labial a.

Question 30

branches of the pterygoid a. (4)

Answer 30

masseteric a. pterygoid a. buccal a. deep temporal a.

Question 31

what drains the infratemporal fossa?

Answer 31

*superficial temporal v. *pterygoid plexus (drains to maxillary vein -> IJV -> EJV)

Question 32

veins serving tissue supplied by the maxillary artery drain into ___ ___

Answer 32

pterygoid plexus

Question 33

What main nerve innervates the temporal fossa?

Answer 33

CN V3 (3 branches)

Question 34

branches of CN V3 that innervate the temporal fossa (3)

Answer 34

auriculotemporal n. (sensory) posterior deep temporal n. (motor) anterior deep temporal n. (motor)

Question 35

auriculotemporal n.: sensory or motor posterior deep temporal n.: sensory or motor anterior deep temporal n.: sensory or motor

Answer 35

auriculotemporal n. (sensory) posterior deep temporal n. (motor) anterior deep temporal n. (motor) *branches of CN V-3 - ITF

Question 36

infratemporal fossa branches of CN V -3 (6)

Answer 36

Meningeal n. Masseteric n. Deep temporal n. Lateral pterygoid n. Medial pterygoid n. Long Buccal n.

Question 37

long buccal n. innervates

Answer 37

* Skin lateral to buccinator * Mucus membrane medial to buccinator * Buccal gingiva of the mandibular molar

Question 38

CN V-3 ____ foramen

Answer 38

ovale

Question 39

Auriculotemporal n. runs ____ and ____ to the parotid gland

Answer 39

posterior and deep

Question 40

Auriculotemporal n. innervates

Answer 40

* Sensory to the skin surrounding and above the ear * External acoustic meatus * Outer tympanic membrane * Some small branches to the TMJ as well

Question 41

Lesser petrosal n. (CN IX) is ____ motor

Answer 41

visceral

Question 42

what nerve runs with Auriculotemporal n. to parotid gland?

Answer 42

lesser petrosal n. (CN IX)

Question 43

what nerve synpases in the otic ganglia?

Answer 43

lesser petrosal n. (CN IX)

Question 44

what nerve runs with lesser petrosal n. to parotid gland?

Answer 44

Auriculotemporal n.

Question 45

lesser petrosal n. (CN IX) is sympathetic or parasympathetic?

Answer 45

parasympathetic

Question 46

lingual n. innervation

Answer 46

* General sensation for anterior 2/3 tongue * Lingual side gingiva. Floor of mouth mucosa

Question 47

what nerve hitchikes with the lingual nerve?

Answer 47

chorda tympani (CN VII)

Question 48

what nerve hitchhikes on CN V-3/lingual nerve?

Answer 48

chorda tympani

Question 49

chorda tympani hitchhikes with what other nerve?

Answer 49

lingual nerve (CN V-3)

Question 50

inferior alveolar n. runs on the ____ side of the ramus of mandible

Answer 50

medial

Question 51

what does the inferior alveolar n. exit through?

Answer 51

mandibular foramen

Question 52

inferior alveolar n. innervation

Answer 52

General sensation for mandibular teeth and buccal gingiva

Question 53

branches of the inferior alveolar n.

Answer 53

* Mylohyoid n. – early branch, to mylohyoid muscle * Mental n. – thru mental foramen, skin over chin * Incisive n. – continuation in mandible past mental foramen, serves 1st premolar, canine, incisors, and gingiva