The Iliococcygeus arises from the inner side of the ischium and from the posterior part of the tendinous arch

Tendinous arch

At the level of a line extending from the lower part of the pubic symphysis to the spine of the ischium is a thickened whitish band in this upper layer of the diaphragmatic part of the pelvic fascia...

 of the obturator fascia, and is attached to the coccyx

Coccyx

The coccyx , commonly referred to as the tailbone, is the final segment of the vertebral column. Comprising three to five separate or fused vertebrae below the sacrum, it is attached to the sacrum by a fibrocartilaginous joint, the sacrococcygeal symphysis, which permits limited movement between...

 and anococcygeal raphé

Anococcygeal raphe

The fibers of the Levator ani pass downward and backward to the middle line of the floor of the pelvis; the most posterior are inserted into the side of the last two segments of the coccyx; those placed more anteriorly unite with the muscle of the opposite side, in a median fibrous raphe, the...

; it is usually thin, and may fail entirely, or be largely replaced by fibrous tissue. It is part of the levator ani

Levator ani

The levator ani is a broad, thin muscle, situated on the side of the pelvis.It is attached to the inner surface of the side of the lesser pelvis, and unites with its fellow of the opposite side to form the greater part of the floor of the pelvic cavity....

group of muscles.

An accessory slip at its posterior part is sometimes named the Iliosacralis.

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