Planes and terms of reference

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Across
  1. 2. Laying with face up
  2. 6. Toward the feet
  3. 7. across
  4. 10. Nearer to center
  5. 12. Middle
  6. 14. Forehead
  7. 16. near the surface
Down
  1. 1. Toward the head
  2. 3. Away from surface
  3. 4. Away from center
  4. 5. Lying on stomach
  5. 8. Outside body
  6. 9. Right and left parts
  7. 11. to the side of
  8. 13. Inside body
  9. 15. towards the middle