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Parts of the Ear - Ossicles

Parts of the Ear - Ossicles. Ossicles. Three tiny bones that transfer sound waves from the eardrum to the cochlea Hammer, anvil and stirrup In old age they may become brittle or damaged resulting in conduction deafness. Parts of the Ear - Cochlea. Cochlea.

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Parts of the Ear - Ossicles

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  1. Parts of the Ear - Ossicles

  2. Ossicles • Three tiny bones that transfer sound waves from the eardrum to the cochlea • Hammer, anvil and stirrup • In old age they may become brittle or damaged resulting in conduction deafness

  3. Parts of the Ear - Cochlea

  4. Cochlea • A hearing organ where sound waves are changed into neural impulses • The major organ of hearing • Filled with fluid; a snail shaped body tube

  5. Parts of the Ear – Oval Window

  6. Oval Window • The point on the surface of the cochlea which receives the sound vibration from the ossicles • As the oval window vibrates, the fluid in the cochlea vibrates moving hair cells along the basilar membrane.

  7. Hair cells along the Basilar Membrane move as the fluid vibrates

  8. Outer ear Middle ear Inner ear Cochlea, partially uncoiled Tectorial membrane Hair cells Hammer Anvil Basilar membrane Stirrup Oval window Sound waves Auditory canal A sound causes the basilar membrane to wave up and down. Eardrum Round window Anatomy of the CochleaAnother View

  9. Hair Cells • The receptor cells for hearing in the cochlea that change sound vibrations into neural impulses. When they move they trigger action potential in the base of the hair cell (transduction). • Similar to the rods and cones within the eye except hair cells are sensitive to vibrations rather than light. • If these are damaged (due to prolonged loud noises) then you have nerve deafness which cannot be helped by a hearing aid.

  10. Parts of the Ear – Auditory Nerve

  11. Auditory Nerve • The nerve that carries sound information from the ears to the thalamus then to the auditory cortex in the temporal lobes of the brain • The auditory nerve is stimulated by the hair cells in the basilar membrane of the cochlea.

  12. Major Divisions of the Ear • Outer Ear—acts as a funnel to direct sound waves towards inner structures • Middle Ear—consists of three small bones (or ossicles) that amplify the sound • Inner Ear—contains the structures that actually transduce sound into neural responseivisions of the Ear

  13. Anatomy of the Ear:A final look

  14. Transduction of Sounds • Sound waves are captured by the Pinna and sent down the ear canal where they stimulate the eardrum. • The eardrum’s vibrations are amplified by the ossicles (hammer, anvil, stirrup). • These vibrate the oval window on the cochlea which in turn vibrates the fluid around the basilar membrane. • The fluid bends the hair cells on the basilar membrane triggering action potential in the base of the hair cells. • This message is transmitted to the auditory nerve which carries the info to the thalamus and then to the auditory cortex of the temporal lobe.

  15. How Can I Remember This? • Please – Pinna • Eat – Ear Canal • Everything – Eardrum • Offered – Ossicles • On – Oval Window • Culinary – Cochlea • Buffet – Basilar Membrane • Helpful – Hair Cells • Attendants – Auditory Nerve • Take – Thalamus • Away – Auditory Cortex • Trash – Temporal Lobe

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