Cortical axons distribute few branches and varicosities over long trajectories in the striatum. Examples of single callosal axons, probably from area 9, to striatum, reconstructed from serial sections. A and B are coronal views of the axons enlarged in C and D. E, photomicrograph and partial reconstruction corresponding to the boxed region of the white axon in D showing small branches and varicosities, some of which might be passing synapses (asterisks). Calibration is 100 µm.