Embryology Of Inner Ear Flashcards

Question 1

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Basic structure of inner ear
Membranous labyrinth has fluid :-
Bone labyrinth has fluid :-

Embryology of membranous labyrinth
1. Membranous Labrinth developed from:-
2. Optic placode - PIT - Optic vesical
From optic versicle Forms :-

Parts of membranous Labyrinth
Sacs :- not cannals 
Which 2 sac has common opening :- 
Known as
Crus communes ???

Alll the sac have 5 openings :- 
Upends into :- 
Utricle opens into :- 
Saccule opens into :- 
How many turns :-

Membranous labyrinth function :-

Sensory end organ of hearing :- 
Present in :- 
Known as :- 
Apex :- 
Apex is early affected in :- 
Base :-

Sensory end organ for balance :-
Present in ::-
In SCC known as :-
In ureteric and saccule known as :-

Cristae is responsible for :-
Utricle is responsible for :-

Rotational acceleration by :-
Linear acceleration by :-

Bony labyrinth:- 
Formation :- 
Parts of bony labyrinth 
1. SCC 
2. Vestibule 
3. Sacala vestibule and Scalia tympani , helicotrema

SCC
Superior SCC significance:-

Scala vestibule opens into :- vestibule ( Bony )
Scala media opens into :- saccule & utricle ( membranous )

Oval window :- connects :-
Into :-
Function :-

Abnormalities of oval window :- 
Fixed stapes foot plate :- 
If foot plate of stapes touches saccule &amp; utricle causes vertigo seen in 
1. ( tullios phenomenon ) :- 
2. Hennebert sign :- seen in

Tullios phenomena:- nystagmus vertigo caused by :-
Seen in :-

Round window connects :-
Through :-
Round window closed by :-

Function of both oval & round window :-

Clinical significance of round window :-

Cochlear aqueduct
Function :-
Converts :-

Inner ear is connected brain via :-
1.
2.
So inf :-

Imp :- in a child who developed labyrinthitis due to meningitis :-
Should do :-
Bcoz :-

Fistula Ante Fenestrum :-
MC site of origin of :-
MC congenital anomaly of middle ear is :-

Congenital anomaly of middle ear :-
1. Michel aplasia :- contraindication for
2. Alexander’s aplasia :-
3. Mondini aplasia :-
4. Scheibes aplasia :-
MC congenital anomaly of inner ear is :-

Endolympatic sac
Utricle and saccule is drained by :-
It lies between:-

Question 2

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