Bone
Sacrum
Five fused vertebrae
High-yield
Anterior (pelvic) and posterior sacral foramina transmit the sacral nerve rami; the sacral hiatus is used for caudal epidural anesthesia.
Overview
A triangular bone formed by five fused sacral vertebrae that wedges between the hip bones to transmit weight to the pelvis.
Reference facts
- Bone type
Irregular (fused)
- Key landmarks
Sacral promontory; Ala; Anterior and posterior sacral foramina; Median sacral crest; Sacral hiatus; Auricular surface
- Articulations
L5 vertebra; Hip bones (sacroiliac joints); Coccyx