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Technically, the inside of the mammalian digestive system is outside of the body.

• di456 4y ago
  Interesting, could you elaborate? Is it because the digestive tract is isolated from the rest of the body? Almost like the body was built up around it?
  • TheSpiceIsLife 4y ago
    In the sense that the inside of the digestive system is contiguous with the skin. You can trace a path from, say, the back of your knee, through the intestines, and out to your eye lid, as you can trace a path from any point on a the outside of a torus. We're just a very complicated doughnut. It's something a medical scientist type I studied under was fond of saying, and I find it a useful model
    • di456 4y ago
      That is wild to think about, thanks for explaining!