infratemporal fossa Flashcards
temporal fossa
lat area of skull overlying squamous portions of frontal, parietal, temporal, and sphenoid bones.
continuous inf w/infratemporal fossa
boundaries of temporal fossa
ant/sup/post- sup temporal line
inferolateral- zygomatic arch
inferomedial- infratemporal crest of temporal and sphenoid bones
sup temporal line
zygomatic, frontal, parietal, temporal
contents of temporal fossa
upper portin of temporalis m and a dense temporalis fascia
infratemporal fossa
deep region of the head lying inf and deep to temporal region
boundaries of infratemporal fossa
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
contents of infratemporal fossa
lower portion of temporalis m medial pterygoid lat pterygoid maxillary a (1st and 2nd portion) pterygoid plexus of vv V3 otic ganglion
TMJ
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
TMJ fnx
operates during chewing
while opening mouth condyle of mandible slides ant against post surface of articular tubercle
ligs of TMJ
lat lig of TMJ
stylomandibular lig
sphenomandibular lig
lat lig of TMJ
thickening of joint capsule
helps to prevent post dislocation of mandible
sytlomandibular lig
thickening of parotid fascia
extends from styloid process to angle of mandible
not very strong
sphenomandibular lig
extends from spine of sphenoid to lingula of mandible
strong, provides the most passive support for TMJ
elevation of mandible
close mouth
temporalis
masseter
medial pterygoid
depression of mandible
open mouth
lateral pterygoid, suprahyoid, infrahyoid
protrusion of mandible
lateral pterygoid, masseter, and medial pterygoid
retrusion of mandible
temporalis, masseter
lat movement of mandible
temporalis same side, pterygoids opposit side, masseter
upper portion TMJ
synovial btwn temporal bone and disc gliding protrusion/retrusion elevation/depression
lower portion TMJ
synovial
btwn disc and mandible
pivot
side to side motion
dislocation of TMJ
mandibular condyle slide ant to articular tubercle (too far) -> unable to close jaw
must be pushed inf then post
may damage auriculotemporal n
mm of masitcatin
1st pharyngeal arch
V3
temporalis
- 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
temporobuccinator band
specialization of temporalis m
dense fascial band spans from temporalis tendon to buccinator
pull buccinator away from teeth
masseter
zygomatic arch
external surface of ramus of mandible
elevates and protrusion of mandible
masseteric brr of V3
medial pterygoid
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
maxillary a
terminal br of external carotid
courses post to neck of mandible
3 portions of maxillary a
mandibular
pterygoid
pterygopalatine
mandibular portion of maxillary
courses deep to neck of mandible brr: deep auricular ant tympanic middle menigeal accessory menigeal inf alveolar
deep auricular a
external acoustic meatus
outer tympatic membrane
TMJ
ant tympanic a
inner tympanic membrane
courses thru petrotympanic fissue to reach middle ear
middle menigeal a
enters middle cranial fossa via foramen ovale to supply dura and skull
inf alveolar a
enters mandibular foramen to supply mandible, mandibular teeth, and chin via mental a
gives rise to mylohyoid a
pterygoid portion
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
pterygopalatine portion
courses thru pterygomaxillary fissure to enter pterygopalatine fossa brr post sup alveolar infraorbital pharyngeal a of pterygoid canal descending palatine sphenopalatine
pterygoid plexus of vv
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
V3
exits via foramin ovale to enter infratemporal fossa
GSA of V3
lower portion of face, external acoustic meatus, floor of oral cavity, ant 2/3s tongue, dura of middle cranial fossa
SVE of V3
mm of mastication tensor tympani tensor veli palatini ant diagastric mylohyoid
GVE-P V3
distributes from VII & IX to salivary glans
SVA V3
distributes from VII to ant 2/3s of tongue
GSA brr of V3
meningeal
buccal
lingual
auriculotemporal
meningeal br V3
re-enters middle cranial fossa via foramen spinosum
supplies dura of middle cranial fossa
buccal n V3
exits infratemporal region by passing btwn 2 heads of lateral pterygoid
pierces mucosa of cheek to supply cheek
lingual n
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
chordae tympani
VII
joins lingual to carry taste and GVE-P to submandibular and sublingual glands
auriculotemporal n
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
motor brr of V3
medial pterygoid n n to tensor tympani n to tensor veli palatini lat pterygoid nn masseteric nn ant and post deep temproral nn
mixed br of V3
inf alveolar GSA & SVE
brr mental and mylohyoid
mandibular n block
needle thru mandibular notch to around main trunk of mandibular n
inf alveolar block
used by dentists for mandibular teeth
injected near entrance of mandibular foramen
preganglionic parasympathetics to sublingual and submandibular glands
salivatory nucleus -> travel w/VII -> chorda tympani -> lingual -> submandibular ganglion
postganglionic parasympathetics to sublingual and submandibular glands
submandibular ganglion -> lingual br of V3
secretomotor
lateral pterygoid
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
