Figure 398 from Chapter 15 (Cytoplasmic Inclusions) of 'The Cell, 2nd Ed.' by Don W. Fawcett M.D. Excitatory synapses on dendritic spines of a Purkinje cell from the rat cerebellum. Axon terminals from parallel fibers can be seen making synaptic contacts on the heads of the spines. Image from Peters, Palay and Webster, Fine Structure of the Nervous System, Philadelphia, W.B. Saunders Co. 1976. A PDF copy of the accompanying chapter is available on the ASCB's BioEDUCATE website.