To preserve neuronal processes for ultrastructural analysis, we describe a protocol for plating of primary neurons on electron microscopy grids followed by flash freezing, yielding samples suspended in a layer of vitreous ice. These samples can be examined with a cryo-electron microscope to visualize structures at the nanometer scale.
Shahmoradian, S. H., Galiano, M. R., Wu, C., Chen, S., Rasband, M. N., Mobley, W. C., Chiu, W. Preparation of Primary Neurons for Visualizing Neurites in a Frozen-hydrated State Using Cryo-Electron Tomography. J. Vis. Exp. (84), e50783, doi:10.3791/50783 (2014).