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Across
  1. 3. a triangular bone made up of 5 fused vertebrae
  2. 6. abdoministhe deep core muscle that stabilizes your lower back (lumbar spine)
  3. 7. the outermost muscle layer
Down
  1. 1. the middle muscle layer
  2. 2. the innermost muscle layer
  3. 4. abdominis the outer abdominal muscle that bends your spine and body forward
  4. 5. your tailbone made up of 4 fused vertebrae