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stapes
The stapes is a bone in the middle ear of humans and other mammals which is involved in the conduction of sound vibrations to the inner ear. The stirrup-shaped small bone is on and transmits these to the oval window, medially. The stapes is the smallest and lightest named bone in the human body, and is so-called because of its resemblance to a stirrup ((ラテン語:Stapes)).
==Structure==
The stapes is the third bone of the three ossicles in the middle ear. The stapes is a stirrup-shaped bone, and the smallest in the human body. It rests on the oval window, to which it is connected by an annular ligament. The stapes is described as having a base, resting on the oval window, as well as a head that articulates with the incus. These are connected by anterior and posterior limbs ((ラテン語:crura)). The stapes articulates with the incus through the incudostapedial joint.〔 The stapes is the smallest bone in the human body, and measures roughly 3 x 2.5mm, greater along the head-base span.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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