Synapses Found to Be More Complex Up the Evolutionary Scale - NYTimes.com

Synapses Found to Be More Complex Up the Evolutionary Scale - NYTimes.com: "But in fact the synapses get considerably more complex going up the evolutionary scale, Dr. Grant and colleagues reported online Sunday in Nature Neuroscience. In worms and flies, the synapses mediate simple forms of learning, but in higher animals they are built from a much richer array of protein components and conduct complex learning and pattern recognition, Dr. Grant said."

This focuses just on the synapses, but the complexity of the chemical pathways may be similarly interesting.