Fig. 1.6.25. Four consecutive serial sections illustrating prenatal synaptogenesis. Retinal axon (A) makes synapses on dendritic spine-like protrusion (D, asterisks). Other synapses are marked by small arrows, an early contact which is still free of vesicles marked by an open arrow. Scale = 300 nm. (Rat, prenatal lateral geniculate nucleus.) Download the high resolution image.