easy
Which is the smallest bone in the human body?
- The pisiform, in the wrist
- The coccyx, at the base of the spine
- The distal phalanx of the little toe
- The stapes, in the middle ear
Why D? And why not the others?
Correct answer: D. The stapes, in the middle ear
The stapes, one of three tiny ossicles in the middle ear, measures only about 3 millimeters and weighs only a few milligrams, making it the smallest and lightest bone you own. Shaped like a stirrup, it transmits eardrum vibrations into the fluid-filled inner ear, and that delicate relay job is exactly why it must stay minuscule and rigid. The pisiform in the wrist and the little toe's last bone are genuinely small and often guessed, but both are several times larger than the stapes. The coccyx feels tiny to the touch, yet it is actually three to five fused vertebrae, far bigger than any ear ossicle.
Source: Encyclopaedia Britannica: stapes