What does the coccyx articulate with?

The coccyx, commonly referred to as the tailbone, articulates with the sacrum. This connection is significant as it forms the terminal part of the vertebral column. The sacrum is a triangular bone located at the base of the spine, and it consists of five fused vertebrae. The coccyx itself typically consists of three to five fused vertebrae.

The articulation between the sacrum and the coccyx allows for a certain degree of movement, especially during activities such as sitting. This movement can provide some flexibility that helps distribute weight when a person is seated. Additionally, the coccyx serves as an attachment site for various muscles, ligaments, and tendons, which play important roles in pelvic stability and support.

In summary, the coccyx's articulation with the sacrum is crucial for maintaining structural integrity in the pelvic region and is part of how the spine accommodates various postures and movements.