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25 Cards in this Set

  • Front
  • Back
5 Main sections of ear
Outer (external) ear
Middle
Inner
Eigth/auditory nerve
Central Auditory System
Many parts of Ear:

Transducer
changes energy to another form
amplifier
info. recieve increases sound
analyzer
analyze frequency characteristics (pitch)
intergrater
process and transmit everything to brain
4 Sections of Temporal Bone
Squamous
Mastoid (many air filled sacs)
Tympanic (below ear canal)
Petrous (HARDEST PORTION AND MOST DENSE, HOUSES BAL. SYS. & MOST PROTECTION
Oval Window
opening into cochlea, sends energy to inner ear-transition f/mechanical energy liquid (hydrodynamic)
Round Window
Compliments oval window, releases fluid f/oval window, but still closed.
Auditory Ossicles (hearing bones)
Malleus (embedded in eardrum)
Incus (attach to malleus)
Stapes (attach to incus -moves more)
Middle Ear -2 muscles
Tensor Tympani
Stapedius

-Both react to loud stimuli-
3 Divisions of Inner Ear
Vestibule
Semi-circular Canal (3)
Cochlea
Endolymph
Unlike any fluid
Predom. in Potassium
Perilymph
Similar to CSF
Made of Sodium
Organ of corti (2)
Inner Portion [inner hair cells- receptors, stiff, 1 row]
Outer Portion [outer hair cells-3 rows, very flexible]
PLACE THEORY
Attributes all analyses of pitch to cochlea
[cochlea like piano keyboard]
VOLLEY THEORY
Aud. nerve recieve impulses and can do several things
-some fire while others not
Auditory Cortex (3)
TEMPORAL AREA
INSULAR AREA
PARIETAL AREA
AUDITORY CORTEX DESCRIPTIONS
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)
SHHH
Self Help for Hard of Hearing
(older hearing impaired)
EAR CANAL
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
Outer Ear ( A & P)
1. Collects sound
2. Help in localizing where sound from
3. help objects stay out of ear
Organs of Corti sit on what Membrane???
Basilar's membrane
{fluid info to electrical stimulation}
sections of cochlea (3)
Scala Vestibule
Scala Media
Scala Tympani
Fluid in Cochlea
SV & ST have PERILYMPH
SM has ENDOLYMPH
Sensory organs of balance
Utricle & Saccule (sensory organs of balance)- Vestibule

[ both filled with endolymph]