Anatomy

Question 1

External ear from where to where

Answer 1

Pinna to tm

Question 2

Function of eustachian tube

Answer 2

Maintains middle ear pressure
Ventilates middle ear
Drainage of m e

Question 3

Internal ear other name

Answer 3

Labryrinth

Question 4

Trigeminal ganglion other name

Answer 4

Gasserian ganglion

Question 5

Str passing thru superior orbital fissure

Answer 5

3 - occulomotor
4 - trochlear
6- abducens
5- trigeminal (opthalmic branch)
All supply the eye
So4 lr6 rest3

Question 6

Str passing throu f rotundum

Answer 6

5th maxillary branch

Question 7

Str passing through foramen ovale

Answer 7

Mandibular branch

Lesser petrosal nerve

Question 8

Internal acoustic meatus

Answer 8

Cn 7-facial

Cn 8th vestibulochochlear

Question 9

Jugular foramen

Answer 9

9
10
11
Int jugular vein
Internal carotid artery

Question 10

Hypoglossal canal

Answer 10

Hypoglossal nerve

Question 11

Meckels cave

Answer 11

Depression by gassrian ganglion

Question 12

Inner ear connects brain via

Answer 12

Internal acoustic meatus

Question 13

Acoustic neuroma arises from
Nerves involved
Upper pole
Lower pole

Answer 13

Arises from internal acoustic meatus
Nerves involved 7th and 8th facial and vestibulochochlear
Upper pole involves f rot f ovale 5th nerve
6th abducens take long course through the petrous apex and passes through superior orbital fissure
Lower pole involves jugular foramen
9 10 11 cn

Question 14

Sigmoid sinus

Answer 14

Form post boundary of mastoid

Ends in jugular foramen forming jugular bulb

Question 15

Sigmoid sinus thrombosis may lead to

Answer 15

Int jugular vein thrombosis

Question 16

Membranous labyrinth

Answer 16

Develops from surface ectoderm
Otic placode
Otic pit
Otic vesicle
Then otic outpouchings  develops and forms the membranous labyrinth

Question 17

Parts of membranous labyrinth

Answer 17

3 semi circular canals
Crus commune
Utricle 
Sacule
Scala media

Question 18

Crus commune

Answer 18

Superior and post scc

Question 19

Scala media takes how many turns

Answer 19

2.5 to 2.75 turns

Question 20

Membranous labyrinth functions

Answer 20

Hearing and balance

Question 21

Sensory end organ of hearing

Answer 21

Organ of corti

Question 22

Sensory end organ of balance

Answer 22

Cristae scc

Maculae in utricle and sacule

Question 23

Bony labyrinth develops from

Answer 23

Mesoderm by enchondral ossification

Question 24

Superior scc dehiscence syndrome

Answer 24

Also called 3rd window syndrome

Sup scc bulges on ant slant of petrous bone

Question 25

Scala vestibuli and scala tympani connected through

Answer 25

Helicotrema

Question 26

Vertigo

Answer 26

Due to dilation as in meniers | Hypermobility as in congenital syphillis

Question 27

Connection between middle ear to scala tympani

Answer 27

Inner ear

Question 28

Round window

Answer 28

Covered by secondary tympanic membrane(3 layered)

Question 29

Endolymphatic sac

Answer 29

Intradural | Meningeal and endosteal layer dura

Question 30

Michel aphasia

Answer 30

Total non dev of inner ear

Question 31

Alexander aphasia

Answer 31

Deformity of basal turn | High freq sound affected

Question 32

Mondini aplasia

Answer 32

Cochlea has 1.5 turns only

Question 33

Scheibe aplasia

Answer 33

Deformity of saccule and cochlea | Most common

Question 34

Ramsay hunt syndrome

Answer 34

Pinna Herpes zoster of geniculate ganglion 7th and 8th nerve

Question 35

Hyperacusis

Answer 35

Paralysis of stapedius | Increased hearing