November 29

The Middle Ear, with stapes circled. The Middle Ear, with the stapes circled in orange.
Photo Credit: Adapted from Blausen.com staff. "Blausen gallery 2014". Wikiversity Journal of Medicine. DOI:10.15347/wjm/2014.010. ISSN 20018762. (Own work) [CC BY 3.0 (http://creativecommons.org/licenses/).

Science Fact

Smallest Bone in the Human Body

At 3 mm x 2.5 mm, the "stapes" in the middle ear is the smallest named bone in the human body.

The shape of a stirrup, this bone is one of three in the middle ear, collectively known as the ossicles. The ossicles convey sound pressure waves from the outer ear (and ear drum) to the inner ear, where the waves are translated into nerve impulses that go to the brain for identification.

The other two ossicles are the malleus (hammer) and the incus (anvil).

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