The smallest bone in the human body is the stapes or stirrup bone located in the middle ear. It is approximately 0.11 inches (0.28 cm) long.
The stapes or stirrup is a bone in the middle ear of humans and other mammals involved in conducting sound vibrations to the inner ear. The stirrup-shaped small bone is on and transmits these to the oval window medially. The stape is the smallest and lightest named bone in the human body and is so-called because of its resemblance to a stirrup (Latin: Stapes).
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, which is connected by an annular ligament. The stapes are described as having a base resting on the oval window and a head that articulates with the incus. These are connected by anterior and posterior limbs (Latin: 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.