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[bone]
[muscle]
[VESSEL]
[NERVE]
Dorsal Surf.
median sacral crest
intermediate sacral crest
lat.sacral crest
sacral groove
sacral hiatus
sacral cornu
spinous tuberc.
dorsal sacral foramina
bar of bone
lower end of sacral canal
inferolat.angle
groove for 5th sacral n.