Coccygeus (Ischiococcygeus)
Pelvic Floor
A vestigial muscle — in tailed animals, this is the tail-wagging muscle.
Function
Supports pelvic floor, flexes coccyx
Origin
Ischial spine and sacrospinous ligament
Insertion
Lateral coccyx and inferior sacrum
Innervation
Branches of S4-S5