The incus is the middle of the ossicles articulating with the head of the malleus anteromedially and the stapes inferomedially.

Its parts include:

  • a body which articulates with the head of the malleus, and to which the superior ligament of the incus is attached (to the roof of the middle ear cavity)
  • a long crus down to the lentiform process (lenticular process) which articulates with the stapes
  • a short crus to which the posterior ligament of the incus is attached

The long crus is the most frequently eroded part of any of the ossicles.

History and etymology

  • derived from the Latin word for anvil
Head and neck anatomy
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Article Information

rID: 1497
System: Head & Neck
Section: Anatomy
Tags: stub, refs, cases
Synonyms or Alternate Spellings:

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Cases and Figures

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    Figure 1: incus
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    Structures of the...
    Figure 2: anatomy of the middle ear
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    Figure 3: annotated CT
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