Tendinous arch of levator ani

The tendinous arch of the levator ani (arcus tendineus levator ani; ATLA) is a fibrous band medial to the obturator internus that extends from the posterior aspect of the pubic bone to the ischial spine and that serves as the origin for part of the levator ani muscle, specifically the iliococcygeus muscle,.

The tendinous arch of the levator ani is interwoven in the fascia obturatoria; both limbs of the arch reach the upper pelvic margin (the posterior up to the Linea terminalis).

The curvature of the arch reaches in extreme cases almost up to the level of the Canalis obturatorius, in other cases it extends deeply down to the lateral wall of the pelvis.

The tendinous arch of the levator ani is crucial for the structural integrity and function of the pelvic floor, providing support to the pelvic organs and contributing to the maintenance of continence.