Embryology

Question 1

Membranous labyrinth has _________

Bony labyrinth has _________

Answer 1

Endolymph

Perilymph

Question 2

Membranous labyrinth develops from

Answer 2

Surface ectoderm

Question 3

Parts of membranous labyrinth

Answer 3

3 Semi circular canals - superior , posterior , lateral
Crus commune
Utricle and saccule

Question 4

Common opening btw superior and posterior SCC is known as

Answer 4

Crus Communis

Question 5

SCC open into utricle and saccule through how many openings

Answer 5

5

Question 6

Utricle and saccule gives 2 ducts that open into ____

Utricle and saccule aslo open into _______

Answer 6

Endolymphatic sac

Membranous cochlea / scala tympani

Question 7

Membranous labyrinth function

Answer 7

Hearing and balance

Question 8

Sensory end organ of hearing____

Sensory end organ of balance__

Answer 8

Organ of corti -hearing

Cristae in Scc and macule in utricle and saccule- balance

Question 9

Cristae responsible for –Type of Acceleration ?

Macule “ “ “”””” “”””” “”””” “””””””” “””” “”””””?

Answer 9

Cristae - rotational

Macule - linear and head tilt and gravitational movement

Question 10

High frequency sound sensed in

Low frequency sound sensed in

Answer 10

Base

Apex

Question 11

Bony labyrinth develops from _____

And type of ossification_______

Answer 11

Mesoderm by enchondral ossification

Question 12

Oval windows function

Answer 12

Conductive hearing

Question 13

Abnormalities of oval windows

Answer 13

Otosclerosis

Vertigo — menieres congenital syphilis

Question 14

Hypermobility of utricle and saccule is found in

Answer 14

Congenital syphilis

Question 15

Round windows is covered by

Answer 15

Secondary tympanic memberan

Question 16

Michel aplasia

Answer 16

Total non development of inner ear

Question 17

Alexander aplasia

Answer 17

Deformity of basal turn high frequency affected