13 / 20
The ossicles (the malleus, incus and stapes) are located..
  • A
    below the outer ear.
  • B
    in the middle ear.
  • C
    in the outer ear.
  • D
    in the inner ear.
Refer to figure.
THE EAR
The ear is used to receive vibrations in the air (sounds) and it acts as a balance organ and acceleration detector. The ear is divided into three sections: the outer, middle and inner ear.
  • OUTER EAR. Collects the vibrations of the air through the Pinna. The ear canal (Meatus) leads to the eardrum. Sound waves will cause the eardrum to vibrate.
  • MIDDLE EAR. The outer and middle ear are separated by the eardrum (tympanum). Three small bones, the Ossicles (malleus, incus and stapes) are connected to the ear drum and transmit the vibrations across the middle ear to the inner ear. The latter is filled with liquid. Attached to the oval window of the inner ear are the last of the bones (the stapes). Here, a diaphragm sets in motion the fluid of the cochlea of the inner ear. The Eustachian Tube vents to the mouth and nose allowing pressure to equalise across the ear drum.
  • INNER EAR. The diaphragm attached to the stapes causes the fluid in the Cochlea to vibrate. Inside the cochlea there is a fine membrane covered with tiny hair-like cells. Their movement will be dependent on the volume and pitch of the original sound. 

Your Notes (not visible to others)



This question has appeared on the real examination, you can find the related countries below.