External and middle ear Flashcards
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
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Mention Nerve supply of external ear
Lateral surface
Auriclotemporal
Great aurciualr
+ Auriclar of vagus fro chonca
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Medial surface :
Lesser Occipital
Great Auricular
Mention blood supply and lympathic one of external ear
Blood supply :
Superficial temp + Post auricular arterties
Lymphatic drainage:
Preauriclar+ post. auricular
Parotid + cervical LNs
Ear muscles are supplied by?
Facial nerve
Auricularis ant .post
Auricularis supeiror
External auditorymeatus formed of ……. and ….. and ….in between
Cartilage + bone and Ismuth in between
Shape of external auditory meatus
S shaped course anterior then posterior then anterior inferior
How to examine ear with otoscope despite the irregullar path of external audiotry meatus
By pulling the auricle upward and backward to straigtens the external auditory meatus
Why children are liable to tympanic membrane perforation ?
This is due to Short straigt external audiotry meatus causing accidental perofrations
Why children are liable to tympanic membrane perforation ?
This is due to Short straigt external audiotry meatus causing accidental perofrations
as bones are poorly developed
How conductive hearing loss ocurrs ?
By sbeacous waxy glands in the skin lining the external auditory meatus blocking the path for sound waves to pass
Mention nerve supply of external audiorty meatus
ANterior : Auriclotemporal
posterior :Auricualr of Vagus *
Someone put cold water in his ear then he stated coughing and vomiting what is your explain ?
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
Explain arterial supply of external audiory meatus
As auricle : sup temporal + Post auricular
+deep auricular of maxillary artery
the external surface of tympanic membrane supplied as …..while the inretneal supplied as ,,,,?
External ear
Middle ear
The external tympanic formed from …..
while internal ……..
in between ?
External Ectoderm skin
Internal endoderm mucous membrane
Fibrous sheet in between
why internal tympanic is convex ?
As malleus is attached to it pulling it
pars flaccida contians which nerve ?
Chorda tympani taste salivary
normal tymanic membrane shows ?
Cone of light
Handle of malleus
umbo
pars tensa
pars flaccida
describe aretrial blood supply of tympanic membrane
externally:
deep aricular of maxillary
internally:
ant + post tympanic arterties
describe venous blood supply of tympanic membrane
Externally :
External juglar vein
Internally :
into transverse sinus
describe nerve supply of tympanic membrane
extenral
anterior inferior : Auricloetmpral
post superior : Auricular of vagus
Intenrally: tympanic of glossopharyngeal
describe lymph drainage of tympanic membrane
Pre-auricular LNs
Retropharyngeal LNs
how to drain infection from tympanic membrane ?
By myringotomy in posterior inferior quadrant of tympanic membrane
mention functions of tensor tympani
and stapeidus
Damping movement of
malleus+ Stapes
for decrasing theri movement by simple sounds
Hyperacusis due to facial nerve injury why?
stapedis supplied by CN7
so stapes move easily making you hear simple sounds
Middle ear contains ?
Oscilae: malleus incus stapes
Muscles : stapedius + tensor tympani
nerve + vessels
Why infection of middle ear can extends to temporal lobe
because roof of middle ear separated from tempral lobe by thin tegmen tympani bony plate
Why IJV can get infection FROM middle ear
as floor of middle ear separtated from IJV by thin bony plate
Middle ear connections
Tube passing tensory tympani
Auditory tube connecting to pharynx
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related to ICA
Mastoid antrum for ear cells may recevie infection from the middle ear
infection of nasopharynx and its transfer to ear is common in chidlren why ?
due to straight estichain tube in children
Mention muscles attached to pharyngotympanic tube
Tensor palati
Tensor tympani
Levatot palati
Salpingopharyneus
Mention muscles attached to pharyngotympanic tube
Tensor palati
Tensor tympani
Levatot palati
Salpingopharyneus
opeining euestichian tube when swallowing to euqlize ear pressure between ear and nose
Horizontal canal in medial wall for
facial nerve
oval window in medial wall closed by ?
base of stapes
round window in medial wall closed by?
2ry tympanic membrane
Mastoid antraum clincial signficance ?>
Can get infection from middle ear causing Sigmoid sinus thrombosis
إِنَّ اللَّهَ لَا يَظْلِمُ النَّاسَ شَيْئًا وَلَٰكِنَّ النَّاسَ أَنفُسَهُمْ يَظْلِمُونَ
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