Sense Organ: Ear

1. Ear
The ear is the organ for the sense of
hearing.

3. Your ears have special parts that collect the sounds and send
information about what you hear to your brain for processing.
The human ear consists of three parts:
• The outer ear
• The middle ear
• The inner ear

4. THE OUTER EAR
The pinna and the ear canal.
The pinna is the part of the ear that you can see and is made of
cartilage that is covered with skin.
The main function of the pinna is to pick up vibrations or sound waves
from the surroundings.

5. The sound waves then travel through an opening or tunnel called the ear
canal.
The skin of the outer part of the ear canal has special glands that produce
a waxy substance called earwax.
Earwax is an important material moisturizes the skin of the ear canal.

6. Eardrum a piece of tissue that vibrates weakly or strongly
depending on the loudness or the softness of sound.
The eardrum separates the ear canal from the middle ear.

7. THE MIDDLE EAR
The middle ear consists of three tiny bones. These are the
hammer(malleus), anvil(incus), and stirrup(stapes). When the
sound waves pass through these three bones, these bones vibrate
and pass the sound waves to the inner ear.
Stapes is the smallest bone in the body

8. THE INNER EAR
The sound waves then enter the inner ear through the cochlea.
The cochlea is a spiral-shaped tube in the inner ear that is filled with
liquid. It is also contains thousands of tiny hair receptors that moves
when the sound waves enter the inner ear. These tiny hairs convert
the sound waves into signals and send them to the brain. The brain
then makes sense of or gives meaning to the signals that it receives
allowing you to understand the sounds you hear.