Infratemporal Fossa Flashcards
What is content of infratemporal fossa?
Temporomandibular joint, Temporalis muscle, lateral/ medial pterygoid, Masseter. Vessels:
Maxillary artery, Pterygoid venous plexus. Nerves:
Mandibular division of trigeminal, Chorda tympani, Otic ganglion
What causes clicking of TMJ?
snapping back of articular disc
What prevents TMJ from dislocating?
articular tubercle
Temporalis muscle attachment, innervation, and action
attach: fossa, coronoid process, and inferior mandible
innervated by mandibular
elevates mandible for retraction and lateral movement
Masseter attachment, innervation, and action
attach to zygomatic arch
innervated by mandibular
does elevation of mandible and protrusion
lateral pterygoid attachment, innervation, and action
attaches to sphenoid and pterygoid plate, capsule of mandible
inneravted by mandibular
does protraction and depression of chin and swings jaw contralateral
medial pterygoid attachment, innervation, and action
attaches pterygoid plate and mandible
innervated by mandibular
elevates mandible, protrudes, and grinds
what are branches of mandibular nerves
lingual - chordae tympani, inferior alveolar, auriculotemporal, and synapes on otic ganglion for parotid gland
Maxillary artery branches
Muscular (massteric, Pterygoid, deep temporal, buccal), Inferior alveolar, Middle meningeal, Descending palatine, Sphenopalatine, Infraorbital
What does pterygoid plexus connect
cavernous sinus, maxillary/retromandibular veins, and deep/facial veins
Why can facial veins be danger zone?
Facial vein (“danger zone”) communicates w/superior ophthalmic vein > cavernous sinus/ cavernous sinus thrombosis >sepsis > acute meningitis
stylohyoid attachments, innervation, function
attach to styloid process, hyoid bone
innervated by facial, and elevates hyoid
styloglossus attachment, innervation, function
attach styloid process and posterior tongue, hypoglossal n, retracts tongue
stylopharyngeus attachment, innervation, function
attach to styloid process, glossopharyngeal n, elevate pharynx/swallow
what is sensory innervation for outer ear?
Great auricular nerve, Auriculotemporal nerve
internal vs. external innervation of tympanic membrane
internal is glossopharyngeal, external is auriculotemporal
central depression of tympanic membrane that malleolus attaches to
umbo
tensor tympani attachments and innervation
pharyngotympanic tube and malleus, CNV3
stapedius attachments and innervation
tympanic cavity and neck of stapes, CNVII
spiral cavity of the inner ear containing the organ of Corti that responds to sound vibrations
cochlea
chamber between cochlea and semicircular canals
has hairy Utricle and Saccule
vestibule
3 fluid filled tubes that relay information about head movement and position.
semicircular canals
where does chorda tympani run through
medial to neck of malleus and superior to the tensor tympani
where does greater petrosal nerve run through
crosses foramen lacerum, deep petrosal nerve aligns with it and it runs through pterygoid canal
where does facial motor nerve exit?
stylomastoid foramen
where does tympanic nerve (CNIX) run through
tympanic plexus on promontory of middle ear, lesser petrosal nerve is a branch of this plexus, penetrates roof of middle ear, and leaves skull through foramen ovale
