L17: Temporal & Infratemporal Fossae

Question 1

landmarks on the mandible ramus

Answer 1

lingual
condylar process
mandibular notch
coronoid process
angle
mental protuberance
mental foramen

Question 2

the mandible angle is btwn ?

Answer 2

ramus - back
body - side chin
of the mandible

Question 3

temporal lines

Answer 3

superior
–for attachment of temporalis fascia

inferior
–for attachment of temporalis muscle

Question 4

temporal boundaries

Answer 4

sup and post
–inf temporal line

ant boundary
–frontal process of zygomatic

inf boundary
–zygomatic arch

Question 5

temporal floor

Answer 5

greater wing of sphenoid
squamous temporal
frontal
parietal

Question 6

contents of temporal fossa

Answer 6

temporalis muscle
deep temporal n and art
zygomaticofacial n

Question 7

all muscles of mastication are innervated by ?

Answer 7

mandibular branch of CN V

the motor branch of the trigeminal n

Question 8

list the muscles of mastication

Answer 8

masseter
temporalis
lat pterygoid
med pterygoid

Question 9

masseter muscle

Answer 9

inf margin
deep surface of zygomatic

lat surface of mandib ramus
coronoid process

elevate, protract mandible

protract = move jaw forward

Question 10

temporalis muscle

Answer 10

temporal fossa floor
temporal fascia

coronoid process
ant border of mandib ramus

elevate, retract mandible

Question 11

lateral pterygoid muscle

Answer 11

–two heads

O: lat pterygoid plate
greater wing sphenoid

I: front of mandib neck
articular disc
TMJ

protract mandible
depress chin bilaterally
grinding unilaterally

Question 12

medial pterygoid muscle

Answer 12

lat pterygoid plate
maxilla

med surface of mandib near angle

elevates, protracts bilateral
grinding unilaterally

Question 13

TMJ

Answer 13

temporomandibular jt
synovial jt

• -head of mandible = condyloid process
• -mandibular fossa of temporal bone

intervening fibrocartilage disc

Question 14

fibrocartilage disc of TMJ

Answer 14

divides jt into sup/inf parts

allows mandible to protract/retract and elevate/depress

Question 15

axes

Answer 15

anterior gliding

hinge-like rotation

Question 16

anterior gliding axis

Answer 16

protract/retraction

grinding occurs when pro/retract of the mandible alt on the two sides

Question 17

hinge-like rotation axis

Answer 17

–during mandibular depression
head of mandible and articular disc move ant

–until the head lies inf to ant tubercle

Question 18

list the TMJ ligaments

Answer 18

TM lig
stylomandibular lig
sphenomandibular lig

Question 19

TML

Answer 19

TM ligament

base of zygomatic process to mandibular neck

Question 20

SML

Answer 20

stylomandibular lig

styloid process to angle

runs btwn parotid and submandibular glands

Question 21

sphenomandibular ligament

Answer 21

sphenoid spine to mandibular lingual

medial to TMJ

remnant of meckel’s cart

Question 22

infratemporal fossa boundaries – ant/sup/med/lat/inf/post

Answer 22

anterior
–maxilla

superior
–greater wing sphenoid

medial
–lat pterygoid plate

lateral

• -coronoid process
• -ramus of mandible

inferior
–continuous w/ neck

posterior

• -TMJ
• -styloid process

Question 23

the infratemporal fossa communicates with orbit via ________ and with the pterygopalatine fossa via _________ .

Answer 23

inf orbital fissure

pterygomaxillary fissure

Question 24

contents of infratemporal fossa

Answer 24

1. mandibular n
2. maxillary art
3. med/lat pterygoid muscles
4. lower temporalis muscle
5. chorda tympani n
6. otic ganglion

Question 25

characteristics of the maxillary artery

Answer 25

–terminal branch of external carotid art

–crosses infratemporal fossa
and enters pterygopalatine fossa via pterygomaxillary fissure

–divided into 3 parts by lat pterygoid muscle

Question 26

maxillary artery branches

Answer 26

divided into 3 parts

1. first part
   - -origin; external carotid art to lower margin inf to lat pterygoid
2. second part
   - -superf or deep to inf lat pterygoid
3. third part
   - -lies w/in pterygopalatine fossa

Question 27

branches of the first part of the maxillary artery

Answer 27

1. deep auricular
2. ant tympanic
3. middle meningeal
4. accessory meningeal
5. inf alveolar

Question 28

deep auricular artery

Answer 28

lies w/in parotid gland

supplies;
TMJ
ext auditory meatus
outer surface of ear drum

Question 29

anterior tympanic artery

Answer 29

supplies;
tympanic cavity
inner surface of ear drum

Question 30

middle meningeal artery

Answer 30

enter cranial cavity via foramen spinosum

supplies;
skull
dura mater

Question 31

accessory meningeal artery

Answer 31

enters cranial cavity via foramen ovale

supplies;
semilunar ganglion V
dura mater

Question 32

inferior alveolar artery

Answer 32

enters mandibular foramen

supplies lower teeth/gums

passes thru mental foramen to become mental artery

Question 33

second part of maxillary artery

Answer 33

branches to muscles of mastication

buccal artery

Question 34

third part of maxillary artery – branches

Answer 34

1. post sup alveolar
2. infraorbital
3. descending palatine
4. art to pterygoid canal
5. pharyngeal artery
6. sphenopalatine artery

Question 35

posterior superior alveolar artery

Answer 35

runs w/ sup alveolar n V2

supplies;
upper molars
premolars
thus the other upper teeth are supplied by a dif art

Question 36

infraorbital artery

Answer 36

enters orbit via inf orbital fissure

runs w/ infraorbital n

supplies;
lower eyelid
side of nose
upper lip
oral mucosa

gives rise to ant and mid sup alveolar arteries
–supple rest of upper teeth

Question 37

descending palatine artery

Answer 37

to soft and hard palates

terminal branch

Question 38

artery to pterygoid canal

Answer 38

to pharynx and auditory tube

Question 39

sphenopalatine artery is a ______ branch of ?

Answer 39

terminal branch

of the 3rd part of maxillary artery