The ear

Question 1

Function of the inner ear

Answer 1

Balance, orientation of head in respect to gravity and direction of accelerative and decelerative forces on head

Question 2

What does the external ear consist of?

Answer 2

Auricle, external auditory meatus and tympanic membrane

Question 3

What is the auricle made of?

Answer 3

Elastic cartilage and skin

Question 4

What does the middle ear consist of?

Answer 4

Auditory ossicles (malleus, incus &stapes) and communicates posteiorly with mastoid air cells anteriorly with pharynx by the Eustachian tube

Question 5

What is the sensory supply of the ear?

Answer 5

External ear= auriculotemporal branch of CNV and small auricular branch of vagus
Internal ear= vestibulocochlear nerve

Question 6

What is the bony labyrinth?

Answer 6

Bony wall of outer ear
-Vestibule
-Semicircular ducts
-Cochlea
Filled with perilymph

Question 7

What is the membranous labyrinthe?

Answer 7

Found within bony labyrinthe
-Utricle
-Saccule
-Semicircular canals
-cochlear canal
Filled with endolymph

Question 8

What are the specialised sensory receptors of the utricle and saccule?

Answer 8

The maculae

Question 9

What are the specialised sensory receptors of the semicircular canals?

Answer 9

The ampullary crests

canals at right angles in 3 planes

Question 10

What are the specialised sensory receptors of the cochlea?

Answer 10

Spiral organs of Corti (sound wave receptors)