L5 The Ear Flashcards
What are the fnx of the ear?
hearing and equlibrium
What does the outer ear consists of?
auricle or pinna
External auditory meatus
Tympanic membrane
What does the middle ear consist of?
tympanic cavity
Eustachian tube
auditory ossicles
Oval and round windows
What are the two main parts of the inner ear?
Bony and membranous labyrinth
What structures does the bony labyrinth contain?
vestibule
semicircular canal
cochlea
What structures does the membranous labyrinth contain?
utricle+saccule
semicircular ducts
cochlear ducts
What are the auricle, external meatus, and tympanic membrane covered w?
skin
What lines the tympanic cavity?
endoderm derived simple squamous epi.
What lines the eustachian tube?
ciliated pseudostratified columnar epi
What separates the middle and inner ear?
oval and round windows
what muscles does the middle ear contain
stapedius
tensor
what are the auditory ossicles?
incus
malleus
stapes
What fluid is kept in bony labyrinth?
perilymph
What fluid is kept in membranous labyrinth?
endolymph
What are the receptor cells in the inner ear?
stereocilia called hair cells
What do all 3 receptor organs in the inner ear have?
sensorineural transduction system
What type of membrane does the organ of corti have?
basilar
What is an example of vascularized endothelium/
stria vascularis
What does the organ of corti contian?
hair cells
What displaces the cupula and stimulates cells?
endolymph
T/F kinocilium can be lost at old age
True
What does the membranous labyrinth develop from?
otic vesicle
What does the outer ear develop from?
1st pharyngeal groove
What does the middle ear develop from?
1st pharyngeal pouch
