Infratemporal Fossa Flashcards
temporal fossa
overlying frontal, parietal, temporal, and sphenoid bones
boundaries temporal fossa
superior temporal line - zygomatic, frontal, parietal, temporal bones
zygomatic arch
infratemporal crest of temporal and sphenoid bones
contents of temporal fossa
upper temporalis muscle and dense temporalis fascia
infratemporal fossa
inferior and deep to temporal region
lateral border of infratemporal fossa
ramus of mandible
superiolateral border of infratemporal fossa
zygomatic arch
superomedial border of infratemporal fossa
infratemporal crest of temporal and sphenoid bones
medial border of infratemporal fossa
lateral pterygoid plate of sphenoid and pharynx
anterior border of infratemporal fossa
maxilla
posterior border of infratemporal fossa
imaginary line connecting posterior border of ramus of mandible and styloid process of temporal bone
inferior border of infratemporal fossa
continuous with submandibular region
contents of infratemporal fossa
temporalis muscle medial pterygoid lateral pterygoid maxillary artery portion 1 and 2 pterygoid plexus of veins mandibular division of CN V - V3 otic ganglion
tempomandibular joint
articulation between mandible condyle and mandibular fossa temporal bone
joint capsule of TMJ
loose above disc and tight below disc
articular disc
dense CT
-separates joint to two synovial lined cavities
lateral ligament of TMJ
thickening of joint capsule
-helps prevent posterior dislocation of mandible
stylomandibular ligament
thickening of parotid fascia
- styloid to angle of mandible
- not very strong
sphenomandibular ligament
spine of sphenoid to lingula of mandible
-strong - most of support to TMJ
most of support to TMJ
sphenomandibular ligament
upper joint
temporal bone and disc
- gliding
- allows protrusion/retrusion and elevation/depression
lower joint
disc and mandibule
- pivot type
- side to side during chewing
dislocated TMJ
mandibular condyles slide too far anteriorly
-inability to close jaw
may damage auriculotemporal nerve
nerve damaged with dislocated TMJ
auriculotemporal nerve
-branch of mandibular nerve
muscles of mastication
from arch 1
innervated by V3
temporalis, masseter, medial pterygoid, lateral pterygoid
temporalis
temporal line to coronoid process anterior surface ramus of mandible
elevate and retract jaw
temporalis innervation
anterior deep temporal n. - elevates mandible
posterior deep temporal n. - retracts mandible
temporobuccinator band
fascial band spans from temporalis tendon to buccinator muscle
pulls buccinator away from teeth when bite down
-dont bite cheek
masseter
zygomatic arch to external ramus of mandible
elevates mandible
assists with protrusion
masseter innervation
V3 via masseteric branches
medial pteryoid muscle
medial surface lateral pterygoid plate and tuberosity of maxilla to internal surface of mandible ramus
elevates mandible and assists protrusion
also, pivot type movements of mandible
innervation medial pterygoid
V3 via medial pterygoid branch
lateral pterygoid muscle
lateral surface of lateral pterygoid plate and infratemporal crest of sphenoid bone to neck of mandibualr condyle/articular disc
protrusion of mandible
lateral pterygoid unilateral action
moves jaw towards contralateral side
-pivot movements of chewing
innervation lateral pterygoid
V3 via lateral pterygoid branch
sphenomeniscal portion of lateral pterygoid
to articular disc - stabilizes**
maxillary artery
from external carotid artery
posterior to neck of mandible
3 portions
- mandibular
- pterygoid
- pterygopalatine
mandibular portion of maxillary artery
deep to neck of mandible 1st portion
deep auricular a anteiror tympanic a middle meningeal a accessory meningeal a inferior alveolar a
pterygoid portion of maxillary artery
through infratemporal region - either superficial/deep
masseteric branches anterior and posterior deep temporal medial pterygoid branches lateral pterygoid branches buccal artery - to cheek
pterygopalatine portion of maxillary artery
through pterygomaxillary fissure to enter PPF
in later notes
branches of maxillary artery
deep auricular anterior tympanic middle meningeal accessory meningeal inferior alveolar
masseteric branches anterior deep temporal posterior deep temporal medial pterygoid branches lateral pterygoid branches buccal artery
posterior superior alveolar a infraorbital a pharyngeal a artery of pterygoid canal descending palatine a sphenopalatine a
pterygoid plexus of veins
large venous plexus investing external and internal surface of lateral pterygoid muscle
blood from infratemporal fossa and face
also cavernous sinus (emissary veins) and pharynx
coalesce to form maxillary vein - travels with maxillary artery
mandibular nerve
V3
-exits middle cranial fossa - foramen ovale
GSA
SVE
GVE-P
SVA
GSA of V3
to lower portion of face
-chin, lower cheek, temporal region, mandibular teeth
SVE of V3
1st arch muscles muscles of mastication tensor tympani tensor veli palatini anterior belly digastric mylogyoid
GVE-P of V3
fibers from CN VII and CN IX to salivary glands
SVA of V3
fibers from CN VII to anterior 2/3 of tongue
GSA branches of V3
meningeal branch - reenters foramen spinosum
buccal n. (between two heads L pterygoid)
lingual n. (between M/L pterygoids)
auricotemporal n. - GSA to TMJ
auriculotemporal nerve
GSA to TMJ, temporal region, auricle, external acoustic meatus, external tympanic membrane
also GVE-P to parotid gland
chorda tympani
of CN VII
- joins lingual nerve
- takes SVA to anterior 2/3 tongue and GVE-P to submandibular and sublingual glands
SVE branches of V3
medial pterygoid nerve to tensor tympani nerve to tensor veli palatini lateral pterygoid nn masseteric nn anterior and posterior deep temporal nn
mixed branch of V3
GSA and SVE
-inferior alveolar n
enters mandibular foramen
- mental n. exits mental foramen
- mylohyoid n. - before enters mandible, SVE to mylohyoid and anterior belly digastric
mandibular nerve block
around main trunk of mandibular nerve
inferior alveolar nerve block
to anesthetize mandibular teeth
-near entrance of mandibular foramen
parasympathetic to parotid gland
GVE-P preganglionic with CN IX - to middle ear
-exits as lesser petrosal nerve
- synapses in otic ganglion
- postganglionic - travel with auriculotemporal nerve of V3
PS to parotid
stimulate salivation
parasympathetic to sublingual and submandibular
preganglionic - CN VII
-chorda tympani
joins lingual nerve
synapse submandibular ganglion
postganglionic - lingual branch of V3
lesion of chorda tympani
lose taste and dry mouth (no SM/SL gland)
auriculotemporal n
branch of V3
carries postganglionic GVE-P from CN IX to parotid gland
lingual n
branch of V3
carries postganglionic GVE-P from CN VII to SL/SM gland
