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infinitespider.com/spider-legs-work

On top of that spiders wouldn't have enough energy to keep those muscles warm (it's rough being a "cold blooded" creature) nor enough oxygen to support a large number of muscles. So if spiders can naturally flex their limbs inward, how do they push their legs outward to run, jump, and move without extensors? The answer is hydraulic pressure.

en.wikipedia.org/wiki/Spider

In all except the most primitive group, the Mesothelae, spiders have the most centralized nervous systems of all arthropods, as all their ganglia are fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure.

www.answers.com/Q/Do_spiders_have_muscles

"Widow spiders" are venomous spiders of the Genus Latrodectus that have a rather bad reputation for eating their mate. However, this is not entirely fair, as not all species of Latrodectus do this.

www.realclearscience.com/blog/2013/02/spiders-their...

While spiders have muscles to flex their spindly limbs inward, they use hydraulic pressure to extend them outward. Almost all other limbed animals have both flexor and extensor muscles, which produce smoother, less jarring, and much less unsettling movements.

cpb-us-e1.wpmucdn.com/.../09/How-Do-Spiders-Move-1bpzbvb.pdf

How Do Spiders Move? A guide by Chris Roh . Spiders are unusual in using the body fluid pressure or hydrostatic pressurefrom their blood (or hemolymph) to move. Spiders use hydrostatic pressure to extend their legs, but muscles to flex the legs. Spiders are able to control their heart rate to control hydrostatic pressure.

evomuscularsystem.weebly.com/spiders.html

SPiders and their muscle system. Spiders have muscles in their legs which makes the legs bend at the joints. There are no muscles for the spider to extend its legs. A spider use muscles to retract its legs, but spiders lack extensor muscles.

answers.yahoo.com/question/index?qid=20110413160047AA9uYR2

Best Answer: Yes of course. Spiders have muscles in their legs which makes the legs bend at the joints. There are no muscles for the spider to extend its legs. Spiders have seven leg segments. The movement of the leg segments are controlled by muscles and by pressure changes in the body's circulatory fluid ...

www.quora.com/Do-bugs-and-spiders-have-muscles

Do bugs and spiders have muscles? Update Cancel. a d b y D u c k D u c k G o. What does Google know about me? Did you know that unlike searching on DuckDuckGo, when you search on Google, they keep your search history forever? That means they know every search ...

answers.yahoo.com/question/index?qid=20080322023239AAqbzCB

Spiders legs are essentially hydrualic, rather than muscular. They only have muscles to move their legs inward, not outward. They constantly have a fluid pressure exerted on them to keep them in an extended state. When they die the pressure is no longer maintained and their legs curl up.

www.healthline.com/health/spider-bites

The majority of the spiders in the United States aren’t poisonous, so even if they do bite you, their bites will heal within a week or so. But some spider bites can lead to serious complications ...