Name
Pronunciation
(cock-se-GEE-us)
Origin/Proximal Attachment
Anterior surface of the ischial spine & sacrospinous ligament
Insertion/Distal Attachment
Lateral border of S5 & the coccyx
Action/Relevance
Forms the posterior portion of the pelvic floor
Innervation
Ventral rami of the fourth & fifth sacral nerves
Notes
Muscle of the lower back that arises from the ischium (lower, rear portion of the hipbone) and from the ligaments that join the spinal column and the sacrum (triangular bone at the base of the spine). It is attached to the lower sacrum and the coccyx (tailbone). In humans its major function is to support the pelvic viscera, especially in the female.