organs of hearing-for UG

1. EAR
ORGANS OF HEARING

2. THE EXTERNAL EAR, THE MIDDLE EAR
AND THE INNER EAR.
The organs of hearing (phonoreceptors) in man are a pair of
ears situated on the head. Ears are also the organs of
balancing. The ear consists of three basic parts-

3. THE EXTERNAL EAR
 It consists of- pinna, external auditory canal,
tympanum.
 Pinna collect sound waves and funnels it
through the ear canal to the ear drum.
 External auditory meatus is a fairly deep
passage from the ear hole down to the tympanic
membrane.
 Tympanic membrane or ear drum is a delicate
membranous structure that vibrates in response
to the sound waves tapping on its outer surface.

4. THE MIDDLE EAR
 Middle ear embedded in cranial bone has an
air filled cavity called tympanic cavity.
Eustachian tube is a passage connecting the
middle ear with the pharynx.
 Middle ear consists of three tiny bones called
ear ossicles that vibrate in response to the
vibrations of the ear drum.
 Three ear ossicles are- malleus, incus,
stapes.

5. THE INNER EAR
 Consists of bony labyrinth and membranous
bony labyrinth.
 Bony labyrinth consists of vestibules and
cochlea.

6. HUMAN EAR

7. PATH TAKEN BY SOUND WAVE IN EAR