One of the important structures in how neural systems are connected are gap junctions. Gap junctions allow for current to flow directly between neurons and in fact, have historically been called electrical synapses. They are important in all tissues, but from our perspective, they are critically important in how neural systems are wired into circuits. As such, we spend quite a bit of time optimizing our workflows to be able to see them.
Below is an animated gif that shows a tilt series of a 90nm thick section being tilted in the electron microscope from -45 degrees to +45 degrees, showing the multi laminar structure of the gap junction in between two neurons.