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The outer ear lies in a recess which can be closed tightly by a dorsal flap of skin.
While in place, the tubes keep the incision from closing, forming an open channel between the middle ear and the outer ear.
Tympanic membrane-The eardrum, a thin disc of tissue that separates the outer ear from the middle ear.
A perforated eardrum (tympanum perforation) is an opening or rupture in the eardrum (tympanic membrane), the thin membrane that separates the outer ear canal from the middle ear.
The eardrum (tympanic membrane) is a thin, semi-transparent membranous wall that stretches across the ear canal and separates the outer ear from the middle ear.