Coccygeus (Ischiococcygeus)

The coccygeus is a small triangle shaped muscle, which is located behind the levator ani muscle. The two coccygeus muscles extend over the surface of the sacrospinous ligaments and they complete the posterior part of the pelvic diaphragm together.

Coccygeus (Ischiococcygeus)

Origin

It emerges through the pelvic surface of ischial spine and sacrospinous ligament from its peak.

Insertion

Coccygeus are attached to the tips of the ischial spines through their peaks and to the lateral margins of the coccyx as well as neighboring borders of the sacrum by their bases. They insert from their base into the last part of sacrum and the sides of upper two parts of coccyx.

Nerve Supply

Coccygeus is supplied by the ventral rami of 4th and 5th sacral nerves (S4, S5).

Actions

• The coccygeus muscles help the levator ani muscles to reinforce the pelvic viscera.
• Minor movements of the coccyx can also be produced by them.