The coccygeus is a muscle of the pelvic floor. It is a small triangular muscle located posterior to the levator ani muscle group.
- Attachments: Originates from the ischial spines and inserts onto the inferior end of the sacrum and coccyx.
- Actions: Supports the pelvic viscera and flexes the coccyx.
- Innervation: Anterior rami of S4 and S5.
- Blood supply: Inferior vesical, inferior gluteal and pudendal arteries.
Adapted from work by OpenStax [CC BY 4.0], via Wikimedia Commons
Fig 1 – Superior (bird’s eye) view of the pelvic floor. Note the prerectal fibres of the puborectalis.