infratemporal fossa

Question 1

temporal fossa

Answer 1

lat area of skull overlying squamous portions of frontal, parietal, temporal, and sphenoid bones.
continuous inf w/infratemporal fossa

Question 2

boundaries of temporal fossa

Answer 2

ant/sup/post- sup temporal line
inferolateral- zygomatic arch
inferomedial- infratemporal crest of temporal and sphenoid bones

Question 3

sup temporal line

Answer 3

zygomatic, frontal, parietal, temporal

Question 4

contents of temporal fossa

Answer 4

upper portin of temporalis m and a dense temporalis fascia

Question 5

infratemporal fossa

Answer 5

deep region of the head lying inf and deep to temporal region

Question 6

boundaries of infratemporal fossa

Answer 6

lat- ramus of mandible
superolateral- zygomatic arch
superomedial-infratemporal crest of temporal and sphenoid bones
med- lateral pterygoid plate & pharynx
ant- maxilla
post- imaginary line connecting post border of ramus of mandible and styloid process of temporal bone
inf- continuous w/submandibular region

Question 7

contents of infratemporal fossa

Answer 7

lower portion of temporalis m
medial pterygoid
lat pterygoid
maxillary a (1st and 2nd portion)
pterygoid plexus of vv
V3
otic ganglion

Question 8

TMJ

Answer 8

condyle of mandible
mandibular fossa and articular tubercle of temporal
contains dense CT articular disc- separates joint into 2 separate synovial lined cavities
loose above disc, tight below

Question 9

TMJ fnx

Answer 9

operates during chewing

while opening mouth condyle of mandible slides ant against post surface of articular tubercle

Question 10

ligs of TMJ

Answer 10

lat lig of TMJ
stylomandibular lig
sphenomandibular lig

Question 11

lat lig of TMJ

Answer 11

thickening of joint capsule

helps to prevent post dislocation of mandible

Question 12

sytlomandibular lig

Answer 12

thickening of parotid fascia
extends from styloid process to angle of mandible
not very strong

Question 13

sphenomandibular lig

Answer 13

extends from spine of sphenoid to lingula of mandible

strong, provides the most passive support for TMJ

Question 14

elevation of mandible

Answer 14

close mouth
temporalis
masseter
medial pterygoid

Question 15

depression of mandible

Answer 15

open mouth

lateral pterygoid, suprahyoid, infrahyoid

Question 16

protrusion of mandible

Answer 16

lateral pterygoid, masseter, and medial pterygoid

Question 17

retrusion of mandible

Answer 17

temporalis, masseter

Question 18

lat movement of mandible

Answer 18

temporalis same side, pterygoids opposit side, masseter

Question 19

upper portion TMJ

Answer 19

synovial
btwn temporal bone and disc
gliding
protrusion/retrusion
elevation/depression

Question 20

lower portion TMJ

Answer 20

synovial
btwn disc and mandible
pivot
side to side motion

Question 21

dislocation of TMJ

Answer 21

mandibular condyle slide ant to articular tubercle (too far) -> unable to close jaw
must be pushed inf then post
may damage auriculotemporal n

Question 22

mm of masitcatin

Answer 22

1st pharyngeal arch

V3

Question 23

temporalis

Answer 23

• temporal lines and deep tmeporal fascia/infratemporal crest
• cornoid process and ant ramus of mandible
• elvates and retracts jaw
• ant and post deep temporal nn V3

Question 24

temporobuccinator band

Answer 24

specialization of temporalis m
dense fascial band spans from temporalis tendon to buccinator
pull buccinator away from teeth

Question 25

masseter

Answer 25

zygomatic arch external surface of ramus of mandible elevates and protrusion of mandible masseteric brr of V3

Question 26

medial pterygoid

Answer 26

medial sruface of lat pterygoid plate and tuberosity of maxilla internal surface ramus of mandible elevates and protrusion and pivot motions of mandible medial pterygoid br of V3

Question 27

maxillary a

Answer 27

terminal br of external carotid | courses post to neck of mandible

Question 28

3 portions of maxillary a

Answer 28

mandibular pterygoid pterygopalatine

Question 29

mandibular portion of maxillary

Answer 29

``` courses deep to neck of mandible brr: deep auricular ant tympanic middle menigeal accessory menigeal inf alveolar ```

Question 30

deep auricular a

Answer 30

external acoustic meatus outer tympatic membrane TMJ

Question 31

ant tympanic a

Answer 31

inner tympanic membrane | courses thru petrotympanic fissue to reach middle ear

Question 32

middle menigeal a

Answer 32

enters middle cranial fossa via foramen ovale to supply dura and skull

Question 33

inf alveolar a

Answer 33

enters mandibular foramen to supply mandible, mandibular teeth, and chin via mental a gives rise to mylohyoid a

Question 34

pterygoid portion

Answer 34

``` courses thru infratemporal region either superficial or deep to lateral pterygoid m brr masseteric brr ant and post deep temporal medial pterygoid br lat pterygoid br buccal a supplies cheek ```

Question 35

pterygopalatine portion

Answer 35

``` courses thru pterygomaxillary fissure to enter pterygopalatine fossa brr post sup alveolar infraorbital pharyngeal a of pterygoid canal descending palatine sphenopalatine ```

Question 36

pterygoid plexus of vv

Answer 36

external and internal surface of lateral pterygoid receives blood from: -infratemporal fossa and nasal cavity via venae comitantes of maxillary a -face via deep facial v and ophthalmic vv -cavernous sinus via emissary vv -pharynx via pharygeal vv coalesces to form maxillary v which exits infratemporal fossa traveling w/maxillary a

Question 37

V3

Answer 37

exits via foramin ovale to enter infratemporal fossa

Question 38

GSA of V3

Answer 38

lower portion of face, external acoustic meatus, floor of oral cavity, ant 2/3s tongue, dura of middle cranial fossa

Question 39

SVE of V3

Answer 39

``` mm of mastication tensor tympani tensor veli palatini ant diagastric mylohyoid ```

Question 40

GVE-P V3

Answer 40

distributes from VII & IX to salivary glans

Question 41

SVA V3

Answer 41

distributes from VII to ant 2/3s of tongue

Question 42

GSA brr of V3

Answer 42

meningeal buccal lingual auriculotemporal

Question 43

meningeal br V3

Answer 43

re-enters middle cranial fossa via foramen spinosum | supplies dura of middle cranial fossa

Question 44

buccal n V3

Answer 44

exits infratemporal region by passing btwn 2 heads of lateral pterygoid pierces mucosa of cheek to supply cheek

Question 45

lingual n

Answer 45

exits infratemporal region by passing btwn medial and lat pterygoids travels to oral cavity supplies ant 2/3s tongue, floor of oral cavity, and mandibular gingivae

Question 46

chordae tympani

Answer 46

VII | joins lingual to carry taste and GVE-P to submandibular and sublingual glands

Question 47

auriculotemporal n

Answer 47

arises form 2 roots whihc surround middle meningeal a exits infratemporal fossa post by passing deep to neck of mandible provides GSA to temporal region, auricle, EAM, and external tympanic membrane

Question 48

motor brr of V3

Answer 48

``` medial pterygoid n n to tensor tympani n to tensor veli palatini lat pterygoid nn masseteric nn ant and post deep temproral nn ```

Question 49

mixed br of V3

Answer 49

inf alveolar GSA & SVE | brr mental and mylohyoid

Question 50

mandibular n block

Answer 50

needle thru mandibular notch to around main trunk of mandibular n

Question 51

inf alveolar block

Answer 51

used by dentists for mandibular teeth | injected near entrance of mandibular foramen

Question 52

preganglionic parasympathetics to sublingual and submandibular glands

Answer 52

salivatory nucleus -> travel w/VII -> chorda tympani -> lingual -> submandibular ganglion

Question 53

postganglionic parasympathetics to sublingual and submandibular glands

Answer 53

submandibular ganglion -> lingual br of V3 | secretomotor

Question 54

lateral pterygoid

Answer 54

lat surface lat pterygoid plate and infratemporal crest of sphenoid bone neck of mandibular condyle; articular disc protrusion; acting unilateral, jaw towards contralateral side lat pterygoid br of V3