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median sacral crest
ridge along posterior midline formed by fused spinous processes

posterior sacral foramina
four pairs of openings on the posterior (back) side

anterior sacral foramina
four pairs on openings on the anterior (front) side

sacral promontory
the anterior bone that sticks out of the sacrums base, marks the border between the lumbar spine and pelvis

sacral canal
continuation of the vertebral canal through the sacrum

superior articulating process
2 bones that sticks out on the upper (base) side of the sacrum, articulates with the inferior articular facets of L5, connecting the lumbar spine to the sacrum

articular surface
ear shaped surface on each side of the sacrum

coccyx
small triangular bone below the sacrum (tailbone), helps support body weight when sitting
