Chapter 16 and 17 Ear Flashcards
Deafness
Significant or total hearing loss caused by loud music, noises, and aging
Ottis Media
Middle ear infection, and most common in children
Tinnitus
constant ringing or roaring sound in the ear
otosclerosis
Rare condition that causes hearing loss
Vertigo Static Equllibrum
Maintain position of the head (not moving) in relation to gravity
Frequency
The number of vibration a sound wave makes per second
Dynamic equilibrum
Maintain position of the head in response to sudden movement
Sensorineural deafness
Damage to either hair cells in cochlea or vestibulocochlear nerve
Conduction deafness
Damage to external or middle ear
Loudness
Louder sounds cause more vibrations, may also stimulate more hair cells
Func. of ear
hearing and balance
The outer ear and what structures make up each region
Pinna, auditory canal, and tympanic membrane (ear drum)
The middle ear and what structures make up each region
Auditory tube, Ossicles: Malleus, Incus, Stapes, and oval window
The inner ear and what structures make up each region
Bony Labyrinth, Vestible, semicurcular canal: Anterior, posterior, lateral, and cochlea, membraneous labyrinthium
Pinna
Collect sound waves
Cercuminous gland
Produce cerumen (ear wax)
Auditory tube
Connect middle ear to throat
Auditory ossicles
Transmit and magnify sound vibraitions to inner ear
Vestibule
Balance semicircular canal
Cochlea
Hearing
Organ of Corit
Contains hair cells (receptors for hearing/sound)
Steps involved in hearing pathway
- Sound waves enter the pinna, travel through the auditory canal
- Sound waves strike the tympanic membrane causing vibrations
- Vibrating TM causes ossicles to vibrate
- Vibrating stapes bone at oval windows generates movement of the cochlear fluid
- Fluid movement stimulates Cilla and lined cochlea
- Cilia sends electrical impulse along auditory nerve to brain for interceptions
Sensorineural Deafness
Damage to either hair cells in cochlea or vestibule cochlear nerve
Conduction deafness
Damage to external or middle ear
