رسمه كلش حلوه و بسيطه تميز ال bony عن ال Cartilaginous بكل من ال ear and Eustachian Tube

علمود محد يخربط منو ال upper و منو ال lower و منو الinner و منو outer و هم نسبه كل واحد شكد

1-Facial nerve=first 3 month =2nd phryngeal arch
2-auricle(pinna)=6weaks=1st and 2nd branchial arch
3-external auditory canal =28 weaks=first branchial arch
4-tympanic membrane=28weak =ectoderm,endoderm,mesoderm
5-middle ear space and Eustachian tube =begin 4th weak =1st pharyngeal pouch
6-malleus and incus =9month after first 4th weak=1st branchial mesoderm
7-stapes(except foot-plate)=9month after first 4th weak=2nd branchial arch mesoderm
8-stapedius+tensor tympani =9month after first 4th weak=mesoderm
9-bony part of inner ear=23weak=from otic capsule (mesoderm)
10-membranous part of inner ear=12weak =from otocyst(ectoderm)

When human sending information to brain?26weak
What the length of external auditory canal
24mm
What the angle of tympanic membrane?
55degree
What the distance between examinar and patient in whispearing test?
60cm

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