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Quest for the basic plan of nervous system circuitry Swanson LWBrain Res Rev 2007[Oct]; 55 (2): 356-72The basic plan of nervous system organization has been investigated since classical antiquity. The first model centered on pneumas pumped from sensory nerves through the ventricular system and out motor nerves to muscles. It was popular well into the 17th century and diverted attention from the organization of brain parenchyma itself. Willis focused on gray matter production and white matter conduction of pneumas in 1664, and by the late 19th century a clear cellular model of nervous system organization based on sensory, motor, and association neuron classes transmitting nerve impulses was elaborated by Cajal and his contemporaries. Today, revolutionary advances in experimental pathway tracing methods, molecular genetics, and computer science inspire systems neuroscience. Seven minimal requirements are outlined for knowledge management systems capable of describing, analyzing, and modeling the basic plan of nervous system circuitry in general, and the plan evolved for vertebrates, for mammals, and ultimately for humans in particular. The goal remains a relatively simple, easy to understand model analogous to the one Harvey elaborated in 1628 for blood circulation in the cardiovascular system. As Cajal wrote in 1909, "To extend our understanding of neural function to the most complex human physiological and psychological activities, it is essential that we first generate a clear and accurate view of the structure of the relevant centers, and of the human brain itself, so that the basic plan--the overview--can be grasped in the blink of an eye."|*Models, Neurological[MESH]|*Nervous System Physiological Phenomena[MESH]|Animals[MESH]|History, 15th Century[MESH]|History, 16th Century[MESH]|History, 17th Century[MESH]|History, 18th Century[MESH]|History, 19th Century[MESH]|History, 20th Century[MESH]|Humans[MESH]|Nerve Net/anatomy & histology/*physiology[MESH]|Nervous System/*cytology[MESH]|Neurons/classification/physiology/ultrastructure[MESH]|Neurosciences/history[MESH]|Silver Staining/methods[MESH] |
