1. THE HUMAN EAR

2. Let’s Discuss
What is Sound?
Table talk

3. The ear is the organ that detects sound
The ear is the organ that detects sound. It not only receives sound, but also aids in balance and body position
The ear is part of the auditory system. Often the entire organ is considered the ear, though it may also be considered just the visible portion

4. The ear is divided in:
Outer Ear

5. Red- The outer ear or pinna collects sound waves.

6. Yellow- Sound funnels through the pinna into the external auditory canal, a short tube that ends at the eardrum (tympanic membrane)

7. The ear is divided in:
Middle Ear

8. Purple- The sound waves make the eardrum vibrate.

9. Green-The eardrum causes three tiny bones to vibrate
Green-The eardrum causes three tiny bones to vibrate. (hammer, anvil, stirrup)

10. When taking off in an airplane, the surrounding air pressure goes from higher to lower. The air in the middle ear expands as the plane gains altitude, and pushes its way into the back of the nose and mouth

11. The ear is divided in:
Inner Ear

12. The cochlea consists of three fluid-filled spaces, which together are responsible for hearing:
Scala tympani
Scala vestibuli
Scala media

13. Blue- The tiny bones make the fluid in the cochlea vibrate and this causes tiny hair cells to vibrate (in cochlea).

14. 8- Vibrations are passed to the auditory nerve which converts the vibrations into nerve impulses. This nerve leads to the brain.

15. The brain interprets sound
The brain interprets sound! The Auditory cortex is located in the Temporal Lobe.

16. How does the Sense of Hearing works?
Let’s Discuss
How does the Sense of Hearing works?

17. What did one ear say to the other ear before they went over the waterfall?

18. What did one ear say to the other ear before they went over the waterfall?
Ear we go!

19. Let’s Review

20. Can we hear all the sounds around us?
Let’s Discuss
Can we hear all the sounds around us?

21. No, The human ear can only hear sounds with frequencies between 20 Hz and 20 kHz
Let’s Discuss