External and middle ear

Question 1

بسم الله الرحمن الرحيم
“ وقال الله إني معكم لئن أقمتم الصلاة وآتيتم الزكاة وآمنتم برسلي وعزرتموهم وأقرضتم الله قرضا حسنا لأكفرن عنكم سيئاتكم ولأدخلنكم جنات تجري من تحتها الأنهار خالدين فيها فمن كفر بعد ذلك منكم فقد ضل سواء السبيل “
*افتح راجع الصور من ال paint
___________________________________
Mention Nerve supply of external ear

Answer 1

Lateral surface
Auriclotemporal
Great aurciualr
+ Auriclar of vagus fro chonca
_____
Medial surface :
Lesser Occipital
Great Auricular

Question 2

Mention blood supply and lympathic one of external ear

Answer 2

Blood supply :
Superficial temp + Post auricular arterties
Lymphatic drainage:
Preauriclar+ post. auricular
Parotid + cervical LNs

Question 3

Ear muscles are supplied by?

Answer 3

Facial nerve
Auricularis ant .post
Auricularis supeiror

Question 4

External auditorymeatus formed of ……. and ….. and ….in between

Answer 4

Cartilage + bone and Ismuth in between

Question 5

Shape of external auditory meatus

Answer 5

S shaped course anterior then posterior then anterior inferior

Question 6

How to examine ear with otoscope despite the irregullar path of external audiotry meatus

Answer 6

By pulling the auricle upward and backward to straigtens the external auditory meatus

Question 7

Why children are liable to tympanic membrane perforation ?

Answer 7

This is due to Short straigt external audiotry meatus causing accidental perofrations

Question 8

Why children are liable to tympanic membrane perforation ?

Answer 8

This is due to Short straigt external audiotry meatus causing accidental perofrations
as bones are poorly developed

Question 9

How conductive hearing loss ocurrs ?

Answer 9

By sbeacous waxy glands in the skin lining the external auditory meatus blocking the path for sound waves to pass

Question 10

Mention nerve supply of external audiorty meatus

Answer 10

ANterior : Auriclotemporal
posterior :Auricualr of Vagus *

Question 11

Someone put cold water in his ear then he stated coughing and vomiting what is your explain ?

Answer 11

As the post part of external auditory meatus is supplied by Auricualr of Vagus that supply :
1- The bronchial tree
2-foregut
Cold water stimulate the nerve stimulating cougung and Vomiting reflexes

Question 12

Explain arterial supply of external audiory meatus

Answer 12

As auricle : sup temporal + Post auricular
+deep auricular of maxillary artery

Question 13

the external surface of tympanic membrane supplied as …..while the inretneal supplied as ,,,,?

Answer 13

External ear
Middle ear

Question 14

The external tympanic formed from …..
while internal ……..
in between ?

Answer 14

External Ectoderm skin
Internal endoderm mucous membrane
Fibrous sheet in between

Question 15

why internal tympanic is convex ?

Answer 15

As malleus is attached to it pulling it

Question 16

pars flaccida contians which nerve ?

Answer 16

Chorda tympani taste salivary

Question 17

normal tymanic membrane shows ?

Answer 17

Cone of light
Handle of malleus
umbo
pars tensa
pars flaccida

Question 18

describe aretrial blood supply of tympanic membrane

Answer 18

externally:
deep aricular of maxillary
internally:
ant + post tympanic arterties

Question 19

describe venous blood supply of tympanic membrane

Answer 19

Externally :
External juglar vein
Internally :
into transverse sinus

Question 20

describe nerve supply of tympanic membrane

Answer 20

extenral
anterior inferior : Auricloetmpral
post superior : Auricular of vagus
Intenrally: tympanic of glossopharyngeal

Question 21

describe lymph drainage of tympanic membrane

Answer 21

Pre-auricular LNs
Retropharyngeal LNs

Question 22

how to drain infection from tympanic membrane ?

Answer 22

By myringotomy in posterior inferior quadrant of tympanic membrane

Question 23

mention functions of tensor tympani
and stapeidus

Answer 23

Damping movement of
malleus+ Stapes
for decrasing theri movement by simple sounds

Question 24

Hyperacusis due to facial nerve injury why?

Answer 24

stapedis supplied by CN7
so stapes move easily making you hear simple sounds

Question 25

Middle ear contains ?

Answer 25

Oscilae: malleus incus stapes Muscles : stapedius + tensor tympani nerve + vessels

Question 26

Why infection of middle ear can extends to temporal lobe

Answer 26

because roof of middle ear separated from tempral lobe by thin tegmen tympani bony plate

Question 27

Why IJV can get infection FROM middle ear

Answer 27

as floor of middle ear separtated from IJV by thin bony plate

Question 28

Middle ear connections

Answer 28

Tube passing tensory tympani Auditory tube connecting to pharynx ___ related to ICA Mastoid antrum for ear cells may recevie infection from the middle ear

Question 29

infection of nasopharynx and its transfer to ear is common in chidlren why ?

Answer 29

due to straight estichain tube in children

Question 30

Mention muscles attached to pharyngotympanic tube

Answer 30

Tensor palati Tensor tympani Levatot palati Salpingopharyneus

Question 31

Mention muscles attached to pharyngotympanic tube

Answer 31

Tensor palati Tensor tympani Levatot palati Salpingopharyneus opeining euestichian tube when swallowing to euqlize ear pressure between ear and nose

Question 32

Horizontal canal in medial wall for

Answer 32

facial nerve

Question 33

oval window in medial wall closed by ?

Answer 33

base of stapes

Question 34

round window in medial wall closed by?

Answer 34

2ry tympanic membrane

Question 35

Mastoid antraum clincial signficance ?>

Answer 35

Can get infection from middle ear causing Sigmoid sinus thrombosis

Question 36

إِنَّ اللَّهَ لَا يَظْلِمُ النَّاسَ شَيْئًا وَلَٰكِنَّ النَّاسَ أَنفُسَهُمْ يَظْلِمُونَ

Answer 36

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