The tailbone, consisting of three to five fused vertebrae at the very bottom of the spine. It serves as an attachment point for muscles, tendons, and ligaments involved in pelvic floor function and provides support when sitting.
From Greek 'kokkyx' meaning cuckoo, because the bone's curved shape resembles a cuckoo's beak. This whimsical naming by ancient Greek anatomists reflects their practice of using familiar objects to describe body structures.
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