Flashcards in Ear Deck (82):
3 divisions of the ear
External, middle, inner
Parts of the external ear
auricle and external auditory canal
Deepest depression of the pinna that leads toward the ear canal
Outer rim of the pinna
Tongue-like flap, anterior to the ear canal
Blood supply to the pinna
superficial temporal and posterior auricular arteries
Nerves to the pinna
Great auricular and auriculotemporal nerves
2.5 cm long tube between the auricle and the tympanic membrane
External auditory canal
Outer 1/3rd of external auditory canal is formed by what?
Inner 2/3rds of external auditory canal is formed by what?
How do you straighten the external auditory canal?
Pull superoposterior on auricle
Another name for ear wax
Blood supply for external auditory canal
superficial temporal, posterior auricular, and deep auricular arteries
Nerves to the external auditory canal and outer surface of tympanic membrane
Auriculotemporal nerve, with some vagus nerve
The petrous part of the temporal bone that contains the auditory ossicles, 2 muscles, and nerves
Middle ear cavity
What separates the middle ear cavity and external auditory canal?
Spaces of the middle ear cavity
Tympanic cavity, epitympanic recess
What does the middle ear cavity communicate with and how?
Mastiod air cells via the aditus and antrum, and the pharynx via auditory tube
Innervation of mucosa of middle ear cavity
Tympanic plexus, mostly glossopharyngeal
What nerve carries pain associated with otitis media?
Roof of middle ear cavity
Floor of middle ear cavity
What does the jugular wall separate?
Middle ear cavity and superior bulb of IJV
What passes thru the jugular wall?
Medial wall of middle ear cavity
What 2 important structures are associated with the promontory of the labyrinthine wall?
Tympanic plexus covers and is formed by the basal coil of the cochlea
Windows in the laybyrinthine wall
Superior: Oval, Inferior: round
What is superoposterior to the oval window?
Facial nerve canal prominence
Superior to the facial nerve prominence
Prominence of the lateral semicircular canal
Most anterior part of the laybrinthine wall contains what?
Chochleariform process and semicanal for tensor tympani
What primarily forms the lateral wall of the middle ear cavity?
Innervation of tympanic membrane
Auriculotemporal on outer surface, vagus nerve for outer/posteroinferior surface, tympanic plexus on inner surface
Apex of the concavity of the tympanic membrane
Where does the tip of the handle of the malleus attach?
Where are the mallear folds/the portion without a firbous core in the tympanic membrane?
Lower part of the tympanic membrane
The reflection of light from the umbo that is seen by using an otoscope
Cone of light
What does the carotid wall separate?
Middle ear and ICA
What makes up the anterior wall of the middle membrane?
What opening does the carotid wall contain?
Opening for autditory (pharyngotympanic) tube
What nerves run thru the carotid wall?
Tensor tympani and chorda tympani
What makes up the posterior wall of the middle ear cavity?
What does the mastiod wall separate?
the middle ear and the mastiod air cells
What connects the mastiod air cells to the middle ear cavity?
(superiorly) aditus leading to the mastiod antrum
What contains the stapedius muscle?
Where do the contents of the prominence of the facial nerve emerge in the middle ear?
The nerve to the stapedius and chorda tympani distrubute off of the mastiod wall
From lateral to medial, what are the auditory ossicles?
Malleus, incus, stapes
Parts of the malleus
head, neck, handle, lateral/anterior processes
What nerve runs on the medial surface of the root of the malleus handle?
Parts of the incus
Body, short/long processes, lenticular process
What part of the incus articualtes with the stapes?
Parts of the stapes
Head, neck, 2 limbs, ovoid base
Where does the stapes connect to the labyrinthine wall?
Oval window and membrane
Where does the tensor tympani turn?
Where does the tensor tympani insert?
Handle of the malleus to tense the tympanic membrane
What large bones does the tensoe tympani attach to?
Semicanal, cartilage of the auditory tube, greater wing of the sphenoid
What innervates the tensor tympani?
Where does the stapedius muscle insert?
Neck of the stapes
What innervates the stapedius muscle?
How is the tympanic plexus formed
The tympanic nerve branches off of the glosspharyngeal nerve, enters middle ear via floor, form plexus on the promontory
Preganglionic parasympathetic fibers in the tympanic nerve
Form the lesser petrosal nerve to the otic ganglion
What ganglion is in the petrous bone near the middle ear?
3 nerves off of the geniculate ganglion
Greater petrosal nerve, nerve to stapedius, chorda tympani
Complicated series of spaces inside the petrous part of the temporal bone
Lines the bony labyrinth
Communication b/t cochlear labyrinth and subarachnoid space
Communication b/t vestibular membranous labyrinth and endolymphatic sac
Snail-shaped organ for audition
Spiral bony core of cochlea
Chamber that begins at the oval window and spirals to the apex
Chamber that begins at the apex and spirals to the round window
How do the 2 chambers communicate?
Fills the 2 chamber space
Middle chamber of cochlea
Fills the cochlear duct
Organ for hearing
Spiral organ of Corti
Course of neurons from cochlea to brain stem
Hair cells, sensory fibers converge to spiral ganglion, cochlear nerve, vestibulocochlear nerve
Why would a lesion in the external autitory canal cause nausea/vomiting?
vagus nerve and gag reflex
Detects head tilt/translational accelerations
Sacs of the vestibular apparatus
2 sacs of vestibular apparatus
Utricle and saccule
Detects rotational accelerations
Lateral/anterior/posterior semicircular canals of the vestibular apparatus