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THE EAR

الكلية كلية طب حمورابي     القسم الكلية ذات القسم الواحد     المرحلة 5
أستاذ المادة مثنى سليم عبدالامير الحميدي       23/05/2017 09:52:07
THE EAR
Anatomy of the ear
The ear is divided to External, Middle and Inner ear.
The external ear:
? It composed of auricle (pinna) and the external auditory meatus.
? It’s function is to collect and transmit sound to the tympanic membrane.

The auricle is composed of cartilage covered with perichondrium to which the skin are very closely adherent.
The lateral surface has characteristic prominences and depressions which are different in every individuals even identical twins. the curved rim is helix, anterior and parallel to it is another prominence, antihelix. Superiorly this divided into two crura, between which is the triangular fossa, above the two crura is the scaphoid fossa. In front of antihelix, and partly encircled by it, is the concha Below the crus of the helix and overlapping the external auditory meatus is the tragus. Opposite to it at the inferior limit of antihelix is the antitragus, below the antitragus is soft area composed of fibrous and adipose tissue called lobule.
The external auditory meatus:
The outer third is cartilaginous, the inner two thirds are bony , the outer cartilagenous portion is covered with skin that contain hair follicles, sebaceous glands and cerminous glands which secrete wax. While these structures are lost in the inner bony meatus where the skin is thin and hair-free.
Owing to the tight union of cartilage and skin any inflammatory process will be extremely painful . The EU canal extends from the concha of the auricle to the TM is approximately 2.4 cm. The diameter of the canal varies greatly between individuals and between different races.


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .