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The Ear - PowerPoint PPT Presentation


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The Ear. The Ear. Pinna – funnels sounds down ear canal towards the ear drum. Pinna. Outer Ear. Pinna. Outer Ear. Middle Ear. Pinna. Outer Ear. Middle Ear. Inner Ear. Pinna. Outer Ear. Middle Ear. Inner Ear. Ear Canal (Auditory Canal) – directs sounds towards the ear drum. Pinna.

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Presentation Transcript
outer ear
Outer Ear

Pinna

Outer Ear

middle ear
Middle Ear

Pinna

Outer Ear

Middle Ear

inner ear
Inner Ear

Pinna

Outer Ear

Middle Ear

Inner Ear

ear canal auditory canal directs sounds towards the ear drum
Ear Canal (Auditory Canal) – directs sounds towards the ear drum

Pinna

Ear canal

Outer Ear

Middle Ear

Inner Ear

slide8
Ear Drum (Tympanic membrane) – consists of a thin sheet of skin and muscle that vibrates with sound waves

Pinna

Ear Drum

Ear canal

Outer Ear

Middle Ear

Inner Ear

hammer attached to ear drum vibrates with ear drum
Hammer – attached to ear drum. Vibrates with ear drum.

Hammer

Pinna

Ear Drum

Ear canal

Outer Ear

Middle Ear

Inner Ear

anvil jointed between hammer and stirrup vibrates in time with hammer
Anvil – jointed between hammer and stirrup. Vibrates in time with hammer.

Anvil

Hammer

Pinna

Ear Drum

Ear canal

Outer Ear

Middle Ear

Inner Ear

stirrup picks up vibrations and passes these on to the oval window

Stirrup

Stirrup – picks up vibrations and passes these on to the oval window.

Anvil

Hammer

Pinna

Ear Drum

Ear canal

Outer Ear

Middle Ear

Inner Ear

slide15

Stirrup

The three Ossicles function together to amplify the sound waves that arrive at the ear drum to about 30x.

Anvil

Hammer

Pinna

Ossicles

Ear Drum

Ear canal

Outer Ear

Middle Ear

Inner Ear

oval window the stirrup transfers vibrations through the oval window to the fluid in the cochlea

Stirrup

Oval Window – the stirrup transfers vibrations through the oval window to the fluid in the cochlea.

Oval window

Anvil

Hammer

Pinna

Ossicles

Ear Drum

Ear canal

Outer Ear

Middle Ear

Inner Ear

slide17

Stirrup

Cochlea – a fluid filled tube lined with clusters of hair cells. As vibrations pass through the fluid, they trigger the hair cells.

Ovalwindow

Anvil

Hammer

Pinna

Ossicles

Cochlea

Ear Drum

Ear canal

Outer Ear

Middle Ear

Inner Ear

slide18

The Organs of Corti are found on the basilar membrane which gets wider towards the tip of the cochlea. The wide end resonates with low pitch (frequencies), while the narrow end resonates with higher pitch (frequencies).

slide19

Hair cells:The outer hair cells help to amplify the vibration, while the inner hair cells in the Organs of Corti are involved in sound detection

Organs of Corti

round window flexible absorbs pressure waves from fluid inside cochlea

Stirrup

Round window – flexible, absorbs pressure waves from fluid inside cochlea.

Ovalwindow

Anvil

Hammer

Pinna

Auditory nerve

Ossicles

Cochlea

Ear Drum

Ear canal

Round window

Outer Ear

Middle Ear

Inner Ear

slide21

Vibrations enter the cochlea through the oval window and are absorbed by the round window at the other end. This helps to dissipate the disturbances.

slide22

Stirrup

Eustachian tube – connects middle ear with buccal cavity – allows equalisation of pressure to alleviate pressure against the eardrum.

Ovalwindow

Anvil

Hammer

Pinna

Auditory nerve

Ossicles

Cochlea

Ear Drum

Eustachian tube

Ear canal

Round window

Outer Ear

Middle Ear

Inner Ear

auditory nerve transmits signals from the hair cells to the brain

Stirrup

Auditory Nerve – transmits signals from the hair cells to the brain.

Ovalwindow

Anvil

Hammer

Pinna

Auditory nerve

Ossicles

Cochlea

Ear Drum

Eustachian tube

Ear canal

Round Window

Outer Ear

Middle Ear

Inner Ear

to the brain

Stirrup

To the brain

Ovalwindow

Anvil

To the brain

Hammer

Pinna

Auditory nerve

Ossicles

Cochlea

Ear Drum

Eustachian tube

Ear canal

Round window

Outer Ear

Middle Ear

Inner Ear

semi circular canals control balance

Stirrup

Semi-circular canals

Semi-circular canals control balance.

Ovalwindow

Anvil

To the brain

Hammer

Pinna

Auditory nerve

Ossicles

Cochlea

Ear Drum

Eustachian tube

Ear canal

Round window

Outer Ear

Middle Ear

Inner Ear

the semi circular canals
The Semi-circular Canals

The Utricle and Saccule are sensitive to gravity and linear acceleration.

slide28

They are arranged at right angles to each other, so they can sense motion in 3 dimensions. Movement in the canals causes fluid to push against the cupola, triggering the hair cells.