Organized Display of Inputs on Neurons

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Each neuron has its view of the world, a spatial arrangement on its receptive surface of the inputs (many or few) impinging on it. The location of each input (on the dendritic tree, cell body, or initial region of the axon) indicates its source and helps to determine its efficacy in bringing about excitation, inhibition, or modulation of target cell activity.

Figure 16 Dendrites: electron micrographs (EMs) show that the CNS is a hypercomplex epithelium, with billions of pieces fitting together precisely, intimately, and with evident benefit for cell-to-cell communication. Upper EM: dendrite (Den) of pyramidal cell from cerebral cortex with dendritic spine (sp) in synaptic contact with axon terminal (At) containing spherical synaptic vesicles. Lower EM: spiny branchlet of a Purkinje cell dendrite (Den) with spines (thorns; t1-t4) synapsing with axon terminals (At) of parallel fibers (Ax). See also text. From The Fine Structure of the Nervous System: Neurons and Their Supporting Cells, 3rd ed., by Alan Peters, Sanford L. Palay, and Henry deF. Webster, copyright 1990 by Alan Peters. Used by permission of Oxford University Press, Inc. (upper EM by Katharine Harriman, lower EM from authors).

Figure 16 Dendrites: electron micrographs (EMs) show that the CNS is a hypercomplex epithelium, with billions of pieces fitting together precisely, intimately, and with evident benefit for cell-to-cell communication. Upper EM: dendrite (Den) of pyramidal cell from cerebral cortex with dendritic spine (sp) in synaptic contact with axon terminal (At) containing spherical synaptic vesicles. Lower EM: spiny branchlet of a Purkinje cell dendrite (Den) with spines (thorns; t1-t4) synapsing with axon terminals (At) of parallel fibers (Ax). See also text. From The Fine Structure of the Nervous System: Neurons and Their Supporting Cells, 3rd ed., by Alan Peters, Sanford L. Palay, and Henry deF. Webster, copyright 1990 by Alan Peters. Used by permission of Oxford University Press, Inc. (upper EM by Katharine Harriman, lower EM from authors).

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