Ear Flashcards
What is the function of the ear?
To pick up sounds
Contains the organ of balance
Helps to organise ourseolves in space and direct complex movements
Draw and label the ear
What are the ears three sections?
- Outer
- Middle
- Inner
What does the outer ear consist of?
- Auricle
- External auditory canal
- Tympanic membrane (ear drum)
What is the function of the auricle?
Direct sound waves into the external auditory canal
What is the external auditory canal?
A narrow passage that extends to the ear drum
The canal is lined with ceruminious glands which secrete ear wax
Sound waves travel along until they reach the ear drum
What happens when sound reaches the ear drum?
Makes it vibrate and is transmitted to bones in the middle ear
What is in the inner ear?
The eardrum
The tympanic cavity
Auditory tube
Why is the inner ear connected to the nasopharynx?
Allows the passage of air and ensure equal pressure inside and outside of the ear
Fluid can be released
What are the three bones/ossicles called?
Hammer
Anvil
Stirrup
What happens when sound reaches the middle ear?
Vibration at the ear drum membrane changes sound waves to mechanical movements
The ossicles act as levers and conduct this to the inner ear
The ossicles amply and transmit the sound to the oval window
What does the inner ear consist of?
Semi-circular canals
Cochlea
Where is the sense of hearing provided?
Receptors in the cochlea duct, they are hair cells.
When stimulated, neurotansmitters are released to the brain.
Describe how we hear
Sound waves are directed from the auricle down the external auditory canal
They reach the ear drum and this vibrates
This is transmitted to the middle ear where the ossicles move
The ossicles act as levels and conduct vibration to the inner ear
These waves stimulate hair cells in the cochlea
This leads to release of neurotransmitters to the brain
Watch https://www.youtube.com/watch?v=WOgI5lAR_bQ
