By: Kaeleigh G, Julie B, Sami S, and Kyle S
Parts of the Ear
External (Outer) Ear: The auricle or
pinna channels the sound and collects
auditory waves.
 Middle Ear (Tympanic Cavity): small
mucous lined cavity within temporal
bone.
 Internal (Inner) Ear: bony chambers
located deep within the temporal bone
behind ear socket

External (Outer) Ear
Pinna - The “ear”. Shell shaped
structure directing sound waves into the
auditory canal
 External Acoustic Meatus - Narrow
chamber into the temporal bone of skull
 Tympanic Membrane - Vibrates when
the sound waves enter the auditory
canal

Middle Ear
Tympanic Cavity - Small air-filled cavity
in the temporal bone
 Ossicles - Transmit vibratory motion of
the eardrum to the fluids of the inner ear
 Hammer & Anvil & Stirrup – Transmit
the vibratory motion of the eardrum to
the fluids of the inner ear

 Eardrum
inner ear
hammer
anvil
stirrup
Inner Ear
Cochlea - house the hearing receptors
 Vestibule – oval cavity in the bony
labyrinth
 Semicircular Canals – balance organ
in the ear

Sensory Receptors in the Ear

Sound vibrations move fluid which
stimulates hearing receptors called
mechanoreceptors. They respond to
the physical force and allow us to hear a
range of sound.
Trace the Pathway of a Sound Wave Through the Ear
1.
2.
3.
4.
5.
6.
7.
8.
9.
Outside Stimulus
Pinna (External ear)
Auditory Canal
Eardrum
Hammer, Anvil, Stirrup
Cochlea
Mechanoreceptors
Auditory nerve
Brain
Types of Hearing Loss

Sensorineural Hearing Loss: Damage to
the inner ear or cochlea, or to the nerve
pathways from the inner ear to the brain.
 Illness
 Drugs
 Head trauma

Conductive Hearing Loss: Sound is not
conducted efficiently from the outer canal
to the eardrum.
 Ear infection
 Fluid in the inner ear