Question

Explain the function of ear by explaining its each part. answer in points please!!
proper answers only.​

Answer 1

EAR
External ear
1. Ear pinna Either sides of the head. Collects sound waves and
directs it into the auditory
canal.
2. Auditory canal Extends from pinna to the
tympanum.
Directs sound waves to the
ear drum / tympanum.
3. Tympanum / ear
drum
Stretched tightly between
the external and middle ear.
When sound waves strike its
surface, it vibrates. These
sound vibrations are then
transmitted to the middle ear.
Middle ear
1. Ear Ossicles Made up of three small
bones.
a. Malleus – is hammer
shaped. Its handle rests on
The 3 ossicles form a
leverage system. They
amplify the sound waves
received from the external
ear and transmit these sound
shaped. Its handle rests on
the tympanum and the head
rests on the incus.
b. Incus- is the central small
bone and is anvil shaped.
c. Stapes- is stirrup shaped
and its base is attached to
the oval window.
ear and transmit these sound
vibrations to the internal ear.
2. Eustachian tube Extends from the pharynx to
the cavity of the middle ear.
It equalizes the air pressure
on either sides of the ear
drum.
3. Oval window On the inner boundary of the
middle ear and inner ear
The sound vibrations from
the stapes (middle ear) is
transmitted through the oval
window to the cochlea of the
inner ear.(this in turn sets the
fluid in the cochlea to vibrate)
4. Round window Below and a little behind the
oval window.
When the stapes transmits
vibrations to the oval window,
the round window moves
outwards. This enables the
fluid in the cochlea to move
freely.
Inner ear (Membranous
labyrinth)
1. Cochlea Bony canal made of two and
half spirals in the inner ear.
Found in the lower portion of
the labyrinth.
Contains the Organ of Corti
which is responsible for
hearing.
2. Organ of Corti In the middle canal / median
canal/cochlear canal of the
cochlea.
Contains receptor cells which
transform sound vibrations
into nerve impulses. (It has
different areas suited to
interpret sounds of different
frequencies.)
3. Semi circular canals Set of three fluid filled
canals arranged at right
angles to each other. Found
in the upper portion of the
labyrinth.
Contains sensory cells
responsible for dynamic
balance.
4. Vestibule Forms the central portion of
the labyrinth. It is made up
of two sacs called the
Utriculus and the Sacculus
Contains sensory cells
responsible for static
balance.
5. Auditory nerve Extends from the inner ear
to the temporal lobe of the
cerebrum.
Transmits nerve impulses
from the Organ of Corti to the
cerebrum.