Hearing

Question 1

Outer ear (3)

Answer 1

1. Pinna (auricle)
2. external auditory canal
3. tympanic membrane

Question 2

Middle ear (2)

Answer 2

1. Connected to nasal cavity by Eustachian tube

2. Ossicles (acronym MIS and HAS)

Question 3

Ossicles

Answer 3

1. Malleus: Hammer
2. Incus: Anvil
3. Stapes: Stirrup

Footplate of stapes rests in the oval window of the cochlea

Question 4

Inner ear (2)

Answer 4

1. Bony Labyrinth

2. Membranous Labyrinth

Question 5

Bony Labyrinth

Answer 5

filled with perilymph

Question 6

Membraneous labyrinth

Answer 6

filled with endolymph

consists of

1. cochlea
2. utricle and saccule
3. semicircular canals

Question 7

cochlea

Answer 7

sound

Question 8

utricle and saccule

Answer 8

linear acceleration

Question 9

semicircular canals

Answer 9

rotational acceleration and balance

Question 10

Projection areas

Answer 10

1. Superios Olive (localizes sound; located in brain stem)
2. Inferior Colliculus (startle reflex; also used by both eyes and ears in vestibo-ocular reflex, which keeps the eyes fixed on a single point as the head rotates)

Question 11

Auditory pathway

Answer 11

cochlea –>
vesibulococlear nerve –>
medial geniculate nucleus (MGN) –>
auditory cortex