What is the number of coccygeal vertebrae in an adult human?

An adult human typically has four coccygeal vertebrae. These vertebrae fuse to form the coccyx, also known as the tailbone. The coccyx serves as an attachment point for various muscles, tendons, and ligaments, playing a role in pelvic support and stability. While the number of coccygeal vertebrae can vary among individuals—sometimes being as few as three or as many as five in certain cases—the most common count is four. This anatomical structure reflects evolutionary adaptations and variations in human anatomy. Understanding this helps in fields like anatomy, kinesiology, and physical therapy, as the coccyx can be involved in injuries or conditions affecting posture and movement.