Auditory System

Question 1

Function of Auditory System

Answer 1

-ear converts acoustic energy (mechanical) into AP

Question 2

External Ear

Answer 2

-transmits sound waves that vibrate tympanic membrane

Question 3

Middle Ear

Answer 3

-air filled chamber
Ossicles: malleus, incus, stapes
Muscles: tensor tympani (V3), stapedius (VII)

Question 4

Internal Ear

Answer 4

-body labyrinth
Auditory Apparatus: cochlea
Vestibular Apparatus: semicircular canals, utricle, saccule

Question 5

Auditory Apparatus

Answer 5

-Hollow cochlea, coiled and filled with fluid
-basilar membrane vibrates from sounds
-Fluid is moved because of vibration and causes hair cells on Organ of Corti to become bent, causing a mechanical transduction where they are attached to tectorial membrane
-Depolarizes and Activates Cochlear N of CN VIII

Question 6

Major Auditory Pathways

Answer 6

-Cochlea < Cochlear nuc in medulla < Superior Olive in Pons <Lat lemniscus and RF in Pons < Inferior Colliculi in midbrain < Medial genticulate body in thalamus < Primary auditory cortex (Temporal Lobe)