Abstract
The external ear includes the auricle and the external auditory canal (Fig. 1.1.1):
• The shape of the auricle is quite complex and is determined by the shape of the aural cartilage.
• The external auditory canal (meatus) measures approximately 2.5 cm in length and is about 9 mm high by 6.5 mm wide. The lateral third consists of the elastic cartilage of the auricle (Fig. 1.1.1). Superiorly the cartilage is lacking between the tragus and the helical crus. This incisura terminalis is used by the surgeon when making an extracartilaginous endaural incision (see Sect. 1.4.6.8) without cutting into the cartilage. The fissures of Santorini in the cartilage of the external auditory canal (Fig. 1.1.1) are a potential route for the spreading of infection to the infratemporal fossa and skull base. The medial third of the external auditory canal is osseous (Fig. 1.1.1).
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References
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Iurato, S., Arnold, W., Dobritz, M. (2010). Basics. In: Anniko, M., Bernal-Sprekelsen, M., Bonkowsky, V., Bradley, P., Iurato, S. (eds) Otorhinolaryngology, Head and Neck Surgery. European Manual of Medicine. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-68940-9_1
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