system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does reattaching limbs/body parts work?

When a limb or other body part gets severed, how does reattaching it work? Do doctors/surgeons/etc have to reconnect every single nerve ending, blood vessel/blood arteries, strands of muscle and cartilage, etc somehow?

If they reconnect blood vessels/arteries, how does the reconnection process work since blood vessels are basically hollow cylinders (do they reconnect it in a way that somehow allows blood to flow again)?
gpt
They do sew together muscles and nerves and veins the best they can, but the general goal is not to make it perfect or even good, the goal is to turn it from totally disconnected arm that is across the room to a really bad injury the body can heal.   


Like you don't sew the bone together so it's perfect, you get it good enough it's just a broken bone that could heal, and like you don't sew the muscles to the point it's a perfectly working muscle, you just sew it till it's a big injury that could heal. etc. You don't sew every single tiny vein, you sew enough of them just good enough the arm won't die then it will heal that over time itself.