Silly billy crossword puzzle

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Across
  1. 3. near the trunk
  2. 4. near the surface
  3. 5. toward the middle line of the body
  4. 7. system the system that holds the body’s structure
  5. 11. the system I flex sometimes
  6. 13. this is the front
  7. 14. these are away from the head
  8. 15. near the bottom/stomach
Down
  1. 1. splits the body down the midline
  2. 2. splits the body in posterior and anterior parts
  3. 6. away from the trunk
  4. 8. away from the midline of the body
  5. 9. these things are near the head
  6. 10. The name for the back
  7. 12. splits the body in superior and inferior parts