L17: Temporal & Infratemporal Fossae Flashcards
landmarks on the mandible ramus
lingual condylar process mandibular notch coronoid process angle mental protuberance mental foramen
the mandible angle is btwn ?
ramus - back
body - side chin
of the mandible
temporal lines
superior
–for attachment of temporalis fascia
inferior
–for attachment of temporalis muscle
temporal boundaries
sup and post
–inf temporal line
ant boundary
–frontal process of zygomatic
inf boundary
–zygomatic arch
temporal floor
greater wing of sphenoid
squamous temporal
frontal
parietal
contents of temporal fossa
temporalis muscle
deep temporal n and art
zygomaticofacial n
all muscles of mastication are innervated by ?
mandibular branch of CN V
the motor branch of the trigeminal n
list the muscles of mastication
masseter
temporalis
lat pterygoid
med pterygoid
masseter muscle
inf margin
deep surface of zygomatic
lat surface of mandib ramus
coronoid process
elevate, protract mandible
protract = move jaw forward
temporalis muscle
temporal fossa floor
temporal fascia
coronoid process
ant border of mandib ramus
elevate, retract mandible
lateral pterygoid muscle
–two heads
O: lat pterygoid plate
greater wing sphenoid
I: front of mandib neck
articular disc
TMJ
protract mandible
depress chin bilaterally
grinding unilaterally
medial pterygoid muscle
lat pterygoid plate
maxilla
med surface of mandib near angle
elevates, protracts bilateral
grinding unilaterally
TMJ
temporomandibular jt
synovial jt
- -head of mandible = condyloid process
- -mandibular fossa of temporal bone
intervening fibrocartilage disc
fibrocartilage disc of TMJ
divides jt into sup/inf parts
allows mandible to protract/retract and elevate/depress
axes
anterior gliding
hinge-like rotation
anterior gliding axis
protract/retraction
grinding occurs when pro/retract of the mandible alt on the two sides
hinge-like rotation axis
–during mandibular depression
head of mandible and articular disc move ant
–until the head lies inf to ant tubercle
list the TMJ ligaments
TM lig
stylomandibular lig
sphenomandibular lig
TML
TM ligament
base of zygomatic process to mandibular neck
SML
stylomandibular lig
styloid process to angle
runs btwn parotid and submandibular glands
sphenomandibular ligament
sphenoid spine to mandibular lingual
medial to TMJ
remnant of meckel’s cart
infratemporal fossa boundaries – ant/sup/med/lat/inf/post
anterior
–maxilla
superior
–greater wing sphenoid
medial
–lat pterygoid plate
lateral
- -coronoid process
- -ramus of mandible
inferior
–continuous w/ neck
posterior
- -TMJ
- -styloid process
the infratemporal fossa communicates with orbit via ________ and with the pterygopalatine fossa via _________ .
inf orbital fissure
pterygomaxillary fissure
contents of infratemporal fossa
- mandibular n
- maxillary art
- med/lat pterygoid muscles
- lower temporalis muscle
- chorda tympani n
- otic ganglion
characteristics of the maxillary artery
–terminal branch of external carotid art
–crosses infratemporal fossa
and enters pterygopalatine fossa via pterygomaxillary fissure
–divided into 3 parts by lat pterygoid muscle
maxillary artery branches
divided into 3 parts
- first part
- -origin; external carotid art to lower margin inf to lat pterygoid - second part
- -superf or deep to inf lat pterygoid - third part
- -lies w/in pterygopalatine fossa
branches of the first part of the maxillary artery
- deep auricular
- ant tympanic
- middle meningeal
- accessory meningeal
- inf alveolar
deep auricular artery
lies w/in parotid gland
supplies;
TMJ
ext auditory meatus
outer surface of ear drum
anterior tympanic artery
supplies;
tympanic cavity
inner surface of ear drum
middle meningeal artery
enter cranial cavity via foramen spinosum
supplies;
skull
dura mater
accessory meningeal artery
enters cranial cavity via foramen ovale
supplies;
semilunar ganglion V
dura mater
inferior alveolar artery
enters mandibular foramen
supplies lower teeth/gums
passes thru mental foramen to become mental artery
second part of maxillary artery
branches to muscles of mastication
buccal artery
third part of maxillary artery – branches
- post sup alveolar
- infraorbital
- descending palatine
- art to pterygoid canal
- pharyngeal artery
- sphenopalatine artery
posterior superior alveolar artery
runs w/ sup alveolar n V2
supplies;
upper molars
premolars
thus the other upper teeth are supplied by a dif art
infraorbital artery
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
descending palatine artery
to soft and hard palates
terminal branch
artery to pterygoid canal
to pharynx and auditory tube
sphenopalatine artery is a ______ branch of ?
terminal branch
of the 3rd part of maxillary artery
