The posterior border of the

ala of sacrum The sacrum (: sacra or sacrums), in human body, human anatomy, is a triangular bone at the base of the vertebral column, spine that forms by the fusing of the sacral vertebrae (S1S5) between ages 18 and 30. The sacrum situates at the upper, ba ...

, shorter than the anterior, also presents two projections separated by a notch, the posterior superior iliac spine and the posterior inferior iliac spine. The posterior superior iliac spine serves for the attachment of the oblique portion of the

posterior sacroiliac ligament The posterior sacroiliac ligament is situated in a deep depression between the sacrum and ilium behind; it is strong and forms the chief bond of union between the bone A bone is a rigid organ that constitutes part of the skeleton in mo ...

s and the

multifidus The multifidus (multifidus spinae; : ''multifidi'') muscle consists of a number of fleshy and tendinous fasciculi, which fill up the groove on either side of the spinous processes of the vertebrae, from the sacrum to the axis. While very thin, t ...

References

External links

* – "The Sacral and Coccygeal Vertebrae, Posterior View" * Bones of the pelvis Ilium (bone) {{musculoskeletal-stub

See also

References

External links