Ear

Question 1

Outer ear made of

Answer 1

1/3 cartilage

2/3 bone

Question 2

What can block rust schism draining from middle ear

Answer 2

Adenoid tonsils

Question 3

Middle ear bones chain

Answer 3

Malleus
Incus
Stapes

Question 4

What muscles in middle ear

And innervation

Answer 4

Tensor tympanic muscle (attaches to malleus- innervated by cnV3 )

Stapedius (attaches to stapes— innervated by cn7)

Question 5

Joints between middle ear bones

Answer 5

Sinovial

Question 6

Middle ear and outer ear amplification??

Answer 6

Outer quietens certain sounds

Middle amplifies

• SA as tympanic membrane is larger than stapes
• lever action of malleus

Question 7

How many turns for cochlea

Answer 7

2.5

Question 8

Stapes goes to which window

Answer 8

Oval

Question 9

Scala vestibule and scala tympani

Which has high…

Answer 9

Perilymph

high na+

Question 10

What’s in between scala vestibule and scala tympani

Answer 10

Scala media// cochlear duct

Question 11

Scala media/ cochlear duct filled with

Answer 11

Endolymph

High k+

Question 12

Organ of corti where

Answer 12

Scala media

Question 13

Basilar membrane base=

Detects what

Answer 13

Narrow stiff

High freq

Question 14

Basilar membrane apex

Detects what

Answer 14

Floppy, wide

Low freq

Question 15

Hair cells inner and outer

Their movement does what

Answer 15

Inner= mechanical transduction

Outer = fine tuning

Movement depolarises cell so glutamate neurotransmitter released

Question 16

What nerve fibre takes signal from neurotransmitter

Answer 16

Cn8 vestibulocochlear

Question 17

Cn8 takes signal where

Answer 17

Central auditory pathway — ECOLI

EIght nerve
Cochlear nucleus
Olive
Lateral leminiscus
Inferior colliculus

medial geniculate body
primary auditory cortex (I’M Auditory)

Question 18

Locating sounds wherrre

Answer 18

Olive nucleus

Question 19

Otolithic organs

Answer 19

Utricle - horizontal plane

Saccule - verticals plane

Contain viscous endolymph and hair cells
Detect gravity and acceleration

Question 20

Semicircular canals

Answer 20

Ring filled with viscous endolymph and cupula at base stretches to cilia

Detect rotation accel and deccel

Head then moves opposite to endolymph

Question 21

Horizontal semicircular canal

Answer 21

Tennis match

Question 22

Superior semicircular canal

Answer 22

Nodding

Question 23

Posterior canal

Answer 23

Ear to shoulder

Question 24

Cold water reflex

Answer 24

Eyes move slowly towards cold water ear then jump back away to normal