The Sacral Vertebrae

(posterior)(anterior)

(1) Neural Spines

(2) Pre-zygapophysis

(3) Sacral Rib

(4) Epipubis

(5) Ishium

(6) Illium

(7) Post-zygapophysis

The sacral vertebrae number in two.  The vertebrae are not as fused, therefore have pre and post-zygapophysises.  There is also a process that extends laterally from each vertebrae, but since they are not completely fused to the vertebrae, they are considered sacral ribs. 

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