The coccygeus is a small, triangular muscle located at the base of the spine, specifically near the coccyx, or tailbone. It plays a role in supporting the pelvic floor and stabilizing the sacrum, which is the triangular bone at the back of the pelvis. This muscle helps with movements such as sitting and standing. In addition to its supportive function, the coccygeus assists in pelvic movements and contributes to the overall posture of the body. It is innervated by the sacral plexus, a network of nerves that supplies the lower back, pelvis, and legs. Proper functioning of the coccygeus is important for maintaining pelvic health.