THE SACRUM::
The sacrum is a large triangular bone composed of five vertebrae the individual parts of which can be discerned the dorsal surface of the sacrum is convex and the pelvic surface is concave the sacrum has a wide base articulating with the fifth lumbar vertebra and a narrow blunted apex inferiorly articulating with the coccyx
THE COCCYX;;
This consists of four (sometimes three or five) vertebrae usually fused together so that their individual characteristics are not apparent the coccyx is triangular in shape articulating at its base with the sacrum and tapering to its apex below
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