Tailbone
Tailbone (Coccyx)
The Tailbone, also known as the Coccyx (pronounced: /ˈkɒksɪks/), is a small, triangular bone located at the base of the spinal column. It is the remnant of a vestigial tail, hence the common name "tailbone".
Etymology
The term "coccyx" was first used in the 1540s and comes from the Greek word "kokkux", which means "cuckoo" due to the resemblance of the bone to the beak of this bird. The term "tailbone" is a direct reference to its position and function in many animals.
Anatomy
The coccyx is usually formed of four individual vertebrae below the sacrum. However, the number of coccygeal vertebrae can vary from three to five. The coccyx is connected to the sacrum by a fibrocartilaginous joint, the sacrococcygeal symphysis, which allows for limited movement.
Function
The tailbone serves as an attachment site for tendons, ligaments, and muscles. It also functions as an integral part of the body that supports weight in a seated position.
Related Terms
- Coccydynia: Pain in the coccyx or tailbone area, often brought on by sitting.
- Sacrum: Large, triangular bone at the base of the spine and at the upper and back part of the pelvic cavity.
- Vertebrae: The individual, interlocking bones that form the spinal column.
See Also
External links
- Medical encyclopedia article on Tailbone
- Wikipedia's article - Tailbone
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