Can you close your eyes and then touch the tip of your nose with your right index finger? No big deal there for most of us. The nervous system function behind that ability is called proprioception. It's the sense of where you are in space, and how all the parts of you coordinate together to do the stuff you need to do.

It's tempting to think of proprioception as a sense unique to humans, or at least to mammals. But would you believe that tiny worms have it too? The sixth sense your place in space summarizes some recently published research about finding neurons in the tiny worm that probably regulate stretch receptors that regulate movement.

Ultimately, this sort of finding could have benefits for dealing with movement disorders like Parkinson's disease:

They (the researchers) have recently discovered some neurons that possibly regulate stretch receptors which tell the body how to move. For patients with Parkinson 's disease, these stretch receptors are thought to be involved in the loss of movement control, so finding a neuron that can tweak these signals could be a step towards developing new Parkinson 's treatments.

On the other hand, I've never seen a worm touch its nose. (Do worms have noses?)