External auditory canal

Dr Craig Hacking and A.Prof Frank Gaillard et al.

The external auditory canal (EAC) extends from the external auditory meatus (EAM) medially to the tympanic membrane.

The external auditory meatus (EAM) may either refer to the canal or the round lateral opening of the EAC.

The EAC is typically 2.5 cm in length and is S-shaped. 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.

Head and neck anatomy
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Article information

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

Cases and figures

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    Figure 1: external ear anatomy (CT)
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  • Drag
    Case 1: external acoustic meatus (normal)
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