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Posterior superior iliac spine

Recommended video: Bony pelvis [27:56]
Overview of the bony pelvis.

The posterior superior iliac spine (PSIS) is a bony projection of the ilium, located at the posterior end of the iliac crest, which spans between it and the anterior superior iliac spine (ASIS). Unlike the ASIS, the PSIS is not as easily palpable, however it is often represented superficially by a dimple (of Venus) above the medial gluteal region, located approximately 4cm lateral to the spinous process of the second sacral vertebra

The PSIS serves as an attachment point for the multifidus muscle, as well as the posterior sacroiliac and sacrotuberous ligaments.

Terminology English: Posterior superior iliac spine
Latin: Spina iliaca posterior superior
Definition Bony prominence of the ilium, marking the posterior end of the iliac crest
Function Attachment for the multifidus muscle and the posterior sacroiliac and sacrotuberous ligaments 

Learn more about the bony pelvis with this study unit (and article):

Posterior superior iliac spine: want to learn more about it?

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