![]() The narrowest part of the external auditory canal is called the isthmus and lies at the junction of the cartilaginous and bony portions of the canal 5. ![]() A normal variant defect in the anteroinferior aspect of the osseous part of the canal that connects with the temporomandibular joint is known as the foramen tympanicum (foramen of Huschke). It normally involves the canal that runs from the ear hole to the eardrum (the external auditory canal). The skin of this inner part is directly applied to periosteum, with no subcutaneous tissue present. Fungal infections of the external auditory canal can pose a great clinical challenge both in diagnosis and in therapy. Fungal ear infection is an infection of the ear with a fungus. The roof and upper part of the posterior wall arise from the squamous part of the temporal bone 4. The anterior wall, floor, and lower part of the posterior wall arise from the tympanic part of the temporal bone 3,4. Acute or chronic superficial fungal infection of the external auditory canal with rare involvement of the middle ear is called otomycosis or fungal otitis. The medial two-thirds is surrounded by bone. Otomycosis is an acute, subacute or chronic fungal infection of the pinna, the external auditory meatus and the ear canal.1 However the disease may occur in the. ![]() Defects in the cartilaginous part of the canal, which allow transmission of infection and malignancy, are known as fissures of Santorini. ![]() The lateral one-third is bounded by a fibrocartilaginous tube continuous with the auricle 3. The external auditory canal is typically 2.5 cm in length and is S-shaped. As the term external auditory meatus is variably used to refer to the canal itself or the porus acusticus externus (the round lateral opening), it may be better to use the term external auditory canal rather than meatus to avoid potential confusion. External otitis, also known as otitis externa or swimmers ear, refers to inflammation of the external auditory canal or auricle. ![]()
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