The Incus has received its name from its supposed resemblance to an anvil, but it is more like a premolar tooth, with two roots, which differ in length, and are widely separated from each other. It consists of a body and two crura.

The body (corpus incudis) is somewhat cubical but compressed transversely. On its anterior surface is a deeply concavo-convex facet, which articulates with the head of the malleus.

The two crura diverge from one another nearly at right angles :

  • The short crus (crus breve; short process), somewhat conical in shape, projects almost horizontally backward, and is attached to the fossa incudis, in the lower and back part of the epitympanic recess.
  • The long crus (crus longum; long process) descends nearly vertically behind and parallel to the manubrium of the malleus, and, bending medialward, ends in a rounded projection, the lenticular process, which is tipped with cartilage, and articulates with the head of the stapes

Cette définition contient du texte provenant d'une édition publique de Gray's Anatomy (20eme édition Américaine de "Gray's Anatomy of the Human Body" publiée en 1918 -


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