Ear Flashcards
1
Q
How do we hear?
A
Sound waves travel down ext auditory meatus until they “hit” tympanic membrane
Tympanic membrane vibrates, causing malleus, incus, stapes to vibrate
Vibration causes fluid in cochlea to move, which causes the cilia to move
Stereocilia create electrical signals which are taken to the brain via CrN VIII
2
Q
Outer ear
A
Pinna, external auditory meatus
- helix
- antihelix
- concha
- tragus
- antitragus
- triangular fossa
3
Q
Middle ear
A
Tympanic membrane
Eustachian tube
Bones
- malleus
- incus
- stapes
4
Q
Inner ear
A
Bony labyrinth (contains perilymph)
- Cochlea
- vestibule
- semi-circular canals
Membranous labyrinth (contains endolymph)
- saccule
- utricle
- ampule
5
Q
What is the function of the eustachian tube?
A
Maintaining normal pressure in middle ear
Drainage of accumulated secretions from middle ear to nasopharynx
