system
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human
What keeps synapses together?

I've read that neurons do not touch at synapses, but are rather really close to each other. So what keeps them from coming undone, especially in a body in movement?
gpt
I think you mean what keeps two neurons together at the synaptic cleft? 

Turns out their are glycoproteins (like you would have on the surface of just about every cell), that bridge between the presynaptic neuron and postsynaptic neuron. The presynaptic neuron has a glycoprotein called neurexin and the postsynaptic neuron has a glycoprotein called neuroligin. 

By altering the genes responsible for the synaptogenesis of these glycoproteins, it's possible to induce certain neurocognitive conditions.