Plexus

Well, kiddo, a plexus is like a big web of wires that your body uses to send messages.

You know how sometimes when you touch something hot, your hand quickly moves away? That's because your nerves send a message to your brain saying, "Ouch! That's hot!" The wires that send that message are part of a plexus.

Now, different parts of your body have different plexuses. For example, your arms and legs have a plexus called the brachial plexus, which sends messages between your arms and your spinal cord.

So, think of a plexus like a giant telephone network. Just like how you need phones connected to each other to make a call, your body needs nerves connected in a plexus to send messages between different parts of your body.