Infratemporal Fossa

Question 1

What is content of infratemporal fossa?

Answer 1

Temporomandibular joint, Temporalis muscle, lateral/ medial pterygoid, Masseter. Vessels:
Maxillary artery, Pterygoid venous plexus. Nerves:
Mandibular division of trigeminal, Chorda tympani, Otic ganglion

Question 2

What causes clicking of TMJ?

Answer 2

snapping back of articular disc

Question 3

What prevents TMJ from dislocating?

Answer 3

articular tubercle

Question 4

Temporalis muscle attachment, innervation, and action

Answer 4

attach: fossa, coronoid process, and inferior mandible
innervated by mandibular
elevates mandible for retraction and lateral movement

Question 5

Masseter attachment, innervation, and action

Answer 5

attach to zygomatic arch
innervated by mandibular
does elevation of mandible and protrusion

Question 6

lateral pterygoid attachment, innervation, and action

Answer 6

attaches to sphenoid and pterygoid plate, capsule of mandible
inneravted by mandibular
does protraction and depression of chin and swings jaw contralateral

Question 7

medial pterygoid attachment, innervation, and action

Answer 7

attaches pterygoid plate and mandible
innervated by mandibular
elevates mandible, protrudes, and grinds

Question 8

what are branches of mandibular nerves

Answer 8

lingual - chordae tympani, inferior alveolar, auriculotemporal, and synapes on otic ganglion for parotid gland

Question 9

Maxillary artery branches

Answer 9

Muscular (massteric, Pterygoid, deep temporal, buccal), Inferior alveolar, Middle meningeal, Descending palatine, Sphenopalatine, Infraorbital

Question 10

What does pterygoid plexus connect

Answer 10

cavernous sinus, maxillary/retromandibular veins, and deep/facial veins

Question 11

Why can facial veins be danger zone?

Answer 11

Facial vein (“danger zone”) communicates w/superior ophthalmic vein > cavernous sinus/ cavernous sinus thrombosis >sepsis > acute meningitis

Question 12

stylohyoid attachments, innervation, function

Answer 12

attach to styloid process, hyoid bone
innervated by facial, and elevates hyoid

Question 13

styloglossus attachment, innervation, function

Answer 13

attach styloid process and posterior tongue, hypoglossal n, retracts tongue

Question 14

stylopharyngeus attachment, innervation, function

Answer 14

attach to styloid process, glossopharyngeal n, elevate pharynx/swallow

Question 15

what is sensory innervation for outer ear?

Answer 15

Great auricular nerve, Auriculotemporal nerve

Question 16

internal vs. external innervation of tympanic membrane

Answer 16

internal is glossopharyngeal, external is auriculotemporal

Question 17

central depression of tympanic membrane that malleolus attaches to

Answer 17

umbo

Question 18

tensor tympani attachments and innervation

Answer 18

pharyngotympanic tube and malleus, CNV3

Question 19

stapedius attachments and innervation

Answer 19

tympanic cavity and neck of stapes, CNVII

Question 20

spiral cavity of the inner ear containing the organ of Corti that responds to sound vibrations

Answer 20

cochlea

Question 21

chamber between cochlea and semicircular canals
has hairy Utricle and Saccule

Answer 21

vestibule

Question 22

3 fluid filled tubes that relay information about head movement and position.

Answer 22

semicircular canals

Question 23

where does chorda tympani run through

Answer 23

medial to neck of malleus and superior to the tensor tympani

Question 24

where does greater petrosal nerve run through

Answer 24

crosses foramen lacerum, deep petrosal nerve aligns with it and it runs through pterygoid canal

Question 25

where does facial motor nerve exit?

Answer 25

stylomastoid foramen

Question 26

where does tympanic nerve (CNIX) run through

Answer 26

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