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25 Cards in this Set
- Front
- Back
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5 Main sections of ear
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Outer (external) ear
Middle Inner Eigth/auditory nerve Central Auditory System |
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Many parts of Ear:
Transducer |
changes energy to another form
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amplifier
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info. recieve increases sound
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analyzer
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analyze frequency characteristics (pitch)
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intergrater
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process and transmit everything to brain
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4 Sections of Temporal Bone
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Squamous
Mastoid (many air filled sacs) Tympanic (below ear canal) Petrous (HARDEST PORTION AND MOST DENSE, HOUSES BAL. SYS. & MOST PROTECTION |
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Oval Window
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opening into cochlea, sends energy to inner ear-transition f/mechanical energy liquid (hydrodynamic)
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Round Window
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Compliments oval window, releases fluid f/oval window, but still closed.
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Auditory Ossicles (hearing bones)
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Malleus (embedded in eardrum)
Incus (attach to malleus) Stapes (attach to incus -moves more) |
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Middle Ear -2 muscles
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Tensor Tympani
Stapedius -Both react to loud stimuli- |
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3 Divisions of Inner Ear
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Vestibule
Semi-circular Canal (3) Cochlea |
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Endolymph
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Unlike any fluid
Predom. in Potassium |
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Perilymph
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Similar to CSF
Made of Sodium |
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Organ of corti (2)
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Inner Portion [inner hair cells- receptors, stiff, 1 row]
Outer Portion [outer hair cells-3 rows, very flexible] |
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PLACE THEORY
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Attributes all analyses of pitch to cochlea
[cochlea like piano keyboard] |
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VOLLEY THEORY
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Aud. nerve recieve impulses and can do several things
-some fire while others not |
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Auditory Cortex (3)
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TEMPORAL AREA
INSULAR AREA PARIETAL AREA |
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AUDITORY CORTEX DESCRIPTIONS
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TA-Primarily looking at frequency characteristics of info.
IN-Temporal aspects of info it gets-related to timing PA- Has to do w/sound associated w/past experiences (hear a song & it makes you think of something) |
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SHHH
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Self Help for Hard of Hearing
(older hearing impaired) |
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EAR CANAL
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1. Horizonal tube-oval shape 2 1/2cm.
2. Take away bacteria 3. Funcion: direct sound to eardrum due to shape, has sound boosting function and smaller= more sounds (see #5) 4. 1/3 is cartilage, still like structure glands that secrete a bitter substance 5. 2/3 is bony (osseous) when get closer to ear drum |
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Outer Ear ( A & P)
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1. Collects sound
2. Help in localizing where sound from 3. help objects stay out of ear |
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Organs of Corti sit on what Membrane???
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Basilar's membrane
{fluid info to electrical stimulation} |
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sections of cochlea (3)
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Scala Vestibule
Scala Media Scala Tympani |
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Fluid in Cochlea
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SV & ST have PERILYMPH
SM has ENDOLYMPH |
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Sensory organs of balance
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Utricle & Saccule (sensory organs of balance)- Vestibule
[ both filled with endolymph] |
