| Term | Definition |
|---|
| Pinna | captures and funnels in vibrating molecules in; pinpoints where sound is coming from(UP OR DOWN); resonates high frequencies |
| concha | bowl of pinna-where you put your headphones/hearing aid location |
| External Auditory canal | Ear canal; takes sound from pinna and sends into the canal, S-shaped; used for protection, ear wax here |
| Cerumen | ear wax-keeps skin of canal lubricated, keeps stuff from getting in along w/ hairs |
| Tympanic Membrane | Ear Drum; VTP: vibrates in sync with intensity and frequency, transfers energy from physical to mechanical, protects middle ear |
| Cone of Light | In TM-reflection of light back, see this 1st and then look around |
| Malleus | in TM-connects to middle ear drum from TM or outer ear canal; largest bone in the middle ear |
| Middle Ear | holds mastoid bone (bee honeycone) that helps conduct sound in |
| Eustachian Tube | Connects middle ear to back of throat; top always open, bottom always closed (opens during yawning, chewing, swallowing, change in pressure) FUNCTIONS:VEP-ventilates air by opening bottom, equalizes pressure from middle air space to pressure outside, protects middle ear |
| Umbo | point of greatest retraction |
| Middle Air space | pressure outside the eustachian tube |
| Ossicles | connections-smallest bones in the body; Hammer, anvil, stir-up |
| incus | connects to head of malleus-transmits sounds across |
| stapes | stir-ups; fits into Oval Window, tiniest bone in the body |
| Oval Window | Opening to inner ear; contracts with stapes bone, transfer of energy from mechanical to hydraulic |
| Tensor Tympani | Muscle in ME-protects ear canal-when something touches it it tenses up and retracts; attaches to malleus |
| Stapedius | attaches to stapes (stir-up); contracts when loud noise happens, tells stapes to pull out and contract |
| Round Window | releases pressure when stapes pushes fluid in through the OW; below OW |
| Functions of Middle Ear | Links TM to inner ear, Impedance Matching Device, Transfer of mechanical energy to hydrolic energy |
| Impedance Matching Device | energy from TM is funneled onto the OW and 30 dB are lost; leverage effect-malleus+incus=long arm, stapes=short arm w/ folcrum in the middle to retreive the lost dB during energy transfers (gain 27) |
| Inner Ear | maintain balance, receives vibrational patterns, Transfers energy from hydraulic to electrical energy through the fluid in the cochlea |
| Boney Labyrinth | series of caves within Inner ear |
Combine with other sets
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