The development of spines in two types of neurons: cerebellar Purkinje cells, and cortical pyramidal neurons, are described. The chapter asserts that some of the features of spinogenesis may be intrinsic to the neuron and some could be extrinsic and activity-reliant. It also points out that Purkinje cells exemplify the two aspects of spine development: the extrinsic, “plastic,” and activity-reliant; and the intrinsic, “hardwired” plan.
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