กระดูก
Acknowledgements
Image source
https://pixabay.com/th/photos/%E0%B8%81%E0%B8%A3%E0%B8%B0%E0%B8%94%E0%B8%B9%E0%B8%81-%E0%B8%81%E0%B8%B0%E0%B9%82%E0%B8%AB%E0%B8%A5%E0%B8%81%E0%B8%A8%E0%B8%B5%E0%B8%A3%E0%B8%A9%E0%B8%B0-%E0%B8%97%E0%B8%B5%E0%B9%88%E0%B8%99%E0%B9%88%E0%B8%B2%E0%B8%81%E0%B8%A5%E0%B8%B1%E0%B8%A7-664596/