The cytoskeleton of frog motor neurons isolated from lumbar hemicords extracted in situ by the method of He et al. (1990) and prepared for electron microscopy by embedment-free thin sectioning.   Unlike conventional thin sections, no stain was required to visualize these images. The nuclear matrix (nu), nuclear lamina (nl) and cytoplasmic cytoskeleton (cy) of the cell body closely resemble those observed in resinless sections from cultured, non-neuronal cells in the reference cited above. The dark areas may represent ribosomes (Fulton et al., 1980) The protein composition of the lattice shown here is unknown. Inset bar = 10um; at higher magnification, bar = 250 nm.