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Hearing

Hearing. HEARING. Hearing is the sense by which sound is understood . Sound Waves. Like a wave in the ocean, a sound wave is a repeating disturbance or movement that transfers energy through matter or space. Waves …. Just as the crest of a water wave is followed

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Hearing

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  1. Hearing

  2. HEARING • Hearingisthesensebywhichsoundisunderstood.

  3. Sound Waves Like a wave in the ocean, a sound wave is a repeating disturbance or movement that transfers energy through matter or space.

  4. Waves… Just as thecrest of a water wave isfollowed by a trough, thecompressionpart of a soundwave isfollowedbyanareawheretheparticlesare farapart.

  5. The Physics of Sound

  6. Hearing • Soundwaves can travelthroughsolids, liquids, and gases. • Whenthewavesenteryourear, theystimulatenervecellsdeepwithinyourear.

  7. Hearing • Messages are senttoyourbrain. • Whenthesoundreachesthehearingarea of thecortex, itresponds and youhear a sound.

  8. ThreeParts of TheEar: • Theouterear • Themiddleear • Theinnerear

  9. TheOuterEar • Youroutereartakesthesoundwaves and sendsthemdowntheear canal tothemiddleear.

  10. TheMiddleEar • Thesoundwaves cause theeardrumtovibrateliketheskin of a musical drumwhenyoutapit. • Thesevibrationsthenmovethroughthreetinybonescalledthehammer, anvil, and stirrup.

  11. TheInnerEar • Thecochlea (KOH klee uh) is a fluid-filledstructureshapedlike a snail’sshell. • Whenthestirrupvibrates, fluid in thecochleabeginstovibrate.

  12. TheInnerEar • Thesevibrationsbendhaircells in thechoclea by a nerve and sendstheinformationtothebrain. • Dependingonhowthenerveendings are stimulated, youhear a differenttype of sound.

  13. Balance • Structures in yourinnerearalso control yourbody´s balance. • Structurescalledcristaeampullaris(KRIHS tee. Am pyew LEER ihs), and themaculae(MA kyah, lee), sensedifferenttypes of bodymovement. • Bothstructurescontaintinyhaircells.

  14. Balance • As yourbodymoves, gel-like fluid surroundingthehaircellsmoves and stimulatesthenervecells at the base of thehaircells. • This produces nervesignalsthat are senttothebrain, whichreadsbodymovements. • Then, thebrainsendssignalstoskeletalmuscles, resulting in bodymovementsthatmaintain balance.

  15. TheEnd!

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