External auditory canal

The external auditory canal (EAC) extends from from the tympanic membrane medially to the external auditory meatus (EAM) laterally. It is typically 2.5 cm in length. The lateral 1.5 cm are bounded by a fibrocartilaginous tube continuous with the auricle. The medial 1 cm is formed by the bony margins of the temporal bone (the squamous part superiorly and the mastoid part posteriorly). The skin of this inner part is directly applied to periosteum, with no subcutaneous tissue present.

Gross anatomy

Boundaries
Contents
Relations

Related pathology


Head and neck anatomy
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Article Information

rID: 6575
System: Head & Neck
Section: Anatomy
Tags: stub, refs, cases
Synonyms or Alternate Spellings:
  • External auditory canal (EAC)

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Cases and Figures

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    Case 1: external acoustic meatus (normal)
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