why can’t we sew back together severed limbs?

Question

If our arm or leg gets sliced off, why can’t our body recognize and repair the severed limb if it’s sewn back together?

In: Biology

Answer 1

You can. It is “just” pretty difficult, since you have to connect up all the blood vessels, lymphatic vessels, nerves, tendons, muscle fibers, etc. Its complicated procedure, and usually you end up with reduced limb function.

But “reduced limb function” is usually preferable to “no limb at all”