Anatomy of the Ear

External ear
1. Collects sound waves and channel them down the auditory channel
  1. Vibration of the tympanic membrane
Middle ear
1. Auditory ossicles
  1. Malleus
    1. 1. Sound waves traveling through air must be converted into pressure waves in fluid.
      2. When the sound waves move the tympanic membrane, the chain of ossicles also moves, pushing the footplate of the stapes into the oval window and displaces the fluid in the cochlea
  2. Incus
  3. Stapes
Inner ear
1. Sensory organ
  1. Cochlea
    1. 3 coiled tubes
      1. Scala vestibuli
        Contains perilymph
        Scala media
        Contains endolymph
        Scala tympani
        Contains perilymph
        Reissner's membrane
        Basilar membrane
        Organ of Corti lies on it
        Inner hair cells
        Outer hair cells
        Helicotrema
        Point of communication between the scala vestibuli and scala tympani. Scala media does not communicate with these two scala.
Tympanic membrane
1. Separates external ear from internal ear
  1. 1. Pearly gray and translucent, with a sharp light reflex and bony landmarks

Resource summary

	Created by heba magdi over 5 years ago

	Copied by group C year 3 over 5 years ago