To straighten out those joints, spiders pressurize them by pumping them full of hemolymph, the spider equivalent of blood. But the other joints in spiders’ legs only have flexor muscles. Like how your biceps and triceps allow you to both flex and extend your forearm. So, paired muscles that work against one another.
It’s equipped with both extensor muscles to extend the legs and flexor muscles to curl them in. The joint where these tubes connect to the body, what you could think of as the “hip”, works much how you’d expect. They harness the power of fluids instead! Spider legs are basically a series of little tubes. This spidery leg-curl of death happens because spiders don’t use muscles to extend their legs. Ever gone to sweep up your floor and noticed a little dead spider mixed in with the dust bunnies? If you paused for a closer look, maybe you noticed that its tiny legs were curled up tight against its body.
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