Infratemporal Fossa Flashcards
Where is the temporal fossa
lateral area of skull overlaying squamous portions of frontal, parietal, temporal and sphenoid bones
What are the boundaries of the temporal fossa
anterior/superior/posterior: superior temporal line (zygomatic, frontal, parietal and temporal bones)
inferior (lateral) zygomatic arch
inferior (medial) infratemporal crest of temporal and sphenoid bones
what are the contents of the temporal fossa
upper portion temporalis m and dense temporalis fascia
Where is the infratemporal fossa
deep region of head lying inferior and deep to temporal region
what are the boundaries of the infratemporal fossa
lateral-ramus of mandible
superior lateral- zygomatic arch
superior medial- lateral pterygoid plate of sphenoid bones
medial- lateral pterygoid plate of sphenoid and pharynx
anterior- maxilla
posterior- imaginary line connecting posterior border of ramus of mandible and styloid process of temporal bone
inferior- continuous with submandibular region
what are the general contents of the infratemporal fossa
lower portion of temporal is m medial pterygoid lateral pterygoid maxillary a (1st and 2nd portion) pterygoid plexus of vv mandibular division of CN V or V3 otic ganglion
Where is the TMJ
condyle of mandible
temporal bone- mandibular fossa and articular tubercle
which way does the condyle of mandible move when opening mouth
anteriorly against posterior surface of articular tubercle
What is within the TMJ between bones
dense CT articular disc that separates joint into two separate synovial lined cavities
Where is the joint capsule of TMJ tight? loose?
tight below disc
loose above disc
What are the ligaments in the TMJ
lateral ligament
stylomandibular ligament
spehnomandibular ligament
what is the role of the lateral ligament of TMJ
thickening that helps prevent posterior dislocation of mandible
what is the role of the stylomandibular ligament
thickening of parotid fascia
extends from styloid process to angle of mandible
not very strong
what is the role of the sphenomandibular ligament
extends from spine of sphenoid to lingula of mandible
strong ligament and prvides most passive support for TMJ
What type of movements does theupper portion of synovial joint of TMJ allow
gliding
protrusion/retrusion and elevation/depression
what type of movements does the lower portion of synovial joint of TMJ allow
pivot type movements between disc and mandible
side to side during chewing
What causes dislocation of TMJ
mandibular condyle slides too far forward and results in inability to close jaw
what corrects TMJ dislocation
inferiorly and posteriorly to correct
what n can be damaged by dislocation of TMJ
auriculotemporal
What pharyngeal arch do the mm of mastication come from
1st because all from V3 trigeminal
o i action inn temporalis m
o: temporal lines and deep temporal fascia/infratemporal crest
i: coronoid process and anterior surface ramus mandible
action: elevates(closes)retracts jaw
inn V3 via anterior and posterior deep temporal nn
what are the special features of the temporalis
temporobuccinator band
dense fascial band that spans from temporalis tendon to buccinator m
function- pulls buccinator m away from teeth
o i action inn masseter
o: zygomatic arch
insertion: external surface of ramus of mandible
action: elevates(closes) mandible and assists with protrusion
inn: V3 via masseteric branches
o i action inn medial pterygoid
o: medial surface lateral pterygoid plate (deep head) and tuberosity of maxilla (superficial head)
i: internal surface of ramus of mandible
action: elevates (closes) mandible and assists with protrusion and pivot movements of mandible
inn: V3 via medial pterygoid branch
o i action inn lateral pterygoid
o: lateral surface of lateral pterygoid plate (deep head) infra temporal crest of sphenoid bone (superficial head)
i: neck of mandibular condyle (deep portion), articular disc( superficial; sphenomeniscal portion)
action: protrusion of mandible, acting unilateral, moves jaw towards contralateral side to produce pivot movements of chewing (side to side)
inn: V3- lateral pterygoid branch
Where does the maxillary course prior to entering infratemporal fossa
posterior to neck of mandible (between sphenomandibular ligament)
what are the 3 portions of the maxillary a
mandibular, pterygoid and pterygopalatine
What are the branches off the mandibular portion of maxillary a
deep auricular anterior tympanic middle meningeal a accessory meningeal a inferior alveolar
what does the deep auricular a supplu
external acoustic meatus, outer TM, and TMJ
what does the anterior tympanic a supply
inner tympanic membrane (courses through petrotympanic fissure to reach middle ear)
what does the middle meningeal a supply
dura and skull
what does the accessory meningeal a supply
dura and skull
what does the inferior alveolar supply
mandible, teeth, chin and gives rise to mylohyoid a before entering mandibular foramen
where does the pterydoid portion of pterygoi a course
either superficial or deep to the lateral pterygoid m
what are the branches off the pterygoid portion of pterygoid a
masseteric anterior and posterior deep temporal medial pterygoid lateral pterygoid buccal a
what are the branches of the pterygopalatine portion of pterygopalatine a
posterior superior alveolar a infraorbital pharyngeal a of pterygoid canal descending palatine a sphenopalatine a
Where is the pterygoid plexus
investing external and internal surface of lateral pterygoid muscle
what other vv does pterygoid plexus communicate with
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 pharyngeal vv
what does the pterygoid plexus join with
coalesces to form maxillary vein
What type of fibers are carried in V3
GSA to lower face
SVE to mm mastication
GVE-P from VII and IX to salivary glands
distributes SVA fibers from VII to anterior 2/3 tongue
What are the sensory branches of V3
Meningeal, buccal, lingual, auriculotemporal
where is the buccal branch V3 and what does it inn
exits infratemporal region by passing between heads of lateral pterygoid m and pierces mucosa of cheek to supply cheek gingiva
where is the lingual branch of V3 and what does it suppl
passes between medial and lateral pterygoid mm
travels to oral cavity
supplies anterior 2/3 tongue, floor cavity and mandibular gingiva
What runs in chorda tympani
SVA for anteior 2/3 taste and GVE-P to submandibular and sublingual glands
Where is the auriculotemporal n and what inn does it carry
arises from 2 roots which surround middle meningeal a
exits infratemporal fossa posteriorly by passing deep to neck
provides GSA to TMJ. temporal region, auricle, external auditory meatus and external TM
which n distributes GVE-P to parotid gland
the auriculotemporal n
What are the motor branches of V3
medial pterygoid n nerve to tensor tympani nerve to tensor veli palatini lateral pterygoid nn masseteric nn anterior and posterior deep temporal nn
What nerve is the mixed branch of V3
Inferior alveolar with a mental n and mylohyoid n
what type of infor does the inferior alveolar n carry
GSA and SVE
What do dentists use to anesthetize mandibular teeth
inferior alveolar n block
What ganglion are the GVE-P fibers to partodi going to first
otic ganglion
Where is the otic ganglion
suspended from V3 lies deep to main trunk V3
contains cell bodies of postganglionic PANs
inn parotid
where are the preganglioninc PANs cell bodies for parotid gland
salivatory nucleus in brainstem
what n do the PANs preganglionic fibers run with to get to parotid gland
IX
as IX exits jugular foramen describe the course of its tympanic branch
enters middle ear via tympanic canaliculus and then travels thru to reform as lesser petrosal n which exits hiatus and enters foramen ovale to synapse on otic ganglion
Where are the cell bodies for the PANs postganglionics
otic ganglion
what n to the postganglionic PANs fibers to parotdi gland run iwith
auriculotemporal n
what is the function of PANs to parotid
secretomotor and stimulation of salivation
What n do PAN preganglionics travel with to get to sublingual and submandibular glands
VII
what is the course of VII PAN fibers
give rise to chorda tympani which exits middle ear thru petrotympanic fissure and enters infratemporal fossa where it joins with lingual n
these synapse in submandibular ganglion
where are the PAN postganglionic cell bodies to sublingual and submandibular glands
submandibular ganglion
what n do the PAN postganglionic fibers run with to submandibular and sublingual glands
lingual branch of V3
what is the action of PANs to submandibular and sublingual glands
secretomotor, stimulates salivation
