45+ Ear Anatomy External Acoustic Meatus
45+ Ear Anatomy External Acoustic Meatus. The external ear (or outer ear) comprises the auricle (or pinna), the external auditory meatus, and the tympanic membrane (eardrum). The external acoustic meatus is a bony canal for the ear canal, a tube running from the outer ear to the middle ear.
Acoustic neuroma, sign called hitzelberger's sign.
The medial 2/3 of the canal is bony and lined with thin skin. Commonly seen in swimmers who do not dry or use ear drops in the meatus after swimming. A normal meatus is about 2 or 3 centimeters long, and it meets the tympanic. The outer ear consists of the exterior structures of the ear, the auricle and external auditory canal.
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