Inner ear

Question 1

How is it structured?

Answer 1

Semicircles which are made up of

• Bony labyrinth
• Membranous labyrinth

Swellings:

• Utricle
• Saccule

Conchlae

Question 2

Bony labyrinth

Answer 2

• Entrance through the oval window
• Contains peri-lymph fluid
• Contains the saccule and the Utricle

Question 3

Membranous labyrinth

Answer 3

-Contains endolymph

Question 4

Semicircular canals

Answer 4

Posterior to the vestibule Bony labyrinth

Have 5 openings

Question 5

Cochlea

Answer 5

• Spiral shape
• Receives sound in the form of vibrations
• Contains the cochlear duct, Scala timpani and the organ of Corti

Question 6

What is the organ of Corti responsible for?

Answer 6

It is responsible for hearing

Question 7

How does heating occur

Answer 7

• Middle ear responsible for transferring sound vibration to Inner ear
• Strapes conducts vibrations into the oval window of the inner ear
• Pressure wave in fluid of cochlear
• Hairs in cochlear convert the sound fibres into nervous impulses which are carried to the brain stem via CN VII

Question 8

How does balance work?

Answer 8

• Semi-circular canals responsible for head-rotation: allow your eyes to fix on something when your head is moving (vestibulo-ocular reflex)
• Saccule: detects linear acceleration in the vertical plane
• Utricle : detect linear acceleration in the horizontal plane

Question 9

Which are the muscles connected to the inner ear

Answer 9

Tensor timpani - to malleus

Stadedius- to stapes

Question 10

Function of the tensor timpani?

Answer 10

Increases the tension on tympanic membrane

Which dampens the amplitude of vibrations