Anatomy In Motion - sacrum (n.) bone at the base of the spine, 1753, from Late Latin os sacrum "sacred bone," from Latin os "bone" (see osseous) + sacrum, neuter of sacer "
![Sacrum posterior view. It also articulates with the hip bones. the sacrum has a base, an apex, and three surfaces a pelvic, | CanStock Sacrum posterior view. It also articulates with the hip bones. the sacrum has a base, an apex, and three surfaces a pelvic, | CanStock](https://cdn.w600.comps.canstockphoto.com/sacrum-posterior-view-drawing_csp39657741.jpg)
Sacrum posterior view. It also articulates with the hip bones. the sacrum has a base, an apex, and three surfaces a pelvic, | CanStock
![Human os sacrum and coccyx diagram - Anatomical Models - Ball State University Digital Media Repository Human os sacrum and coccyx diagram - Anatomical Models - Ball State University Digital Media Repository](https://dmr.bsu.edu/digital/api/singleitem/image/pdf/AnatMod/210/default.png)