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K⁺ channels and their distribution in large cortical pyramidal neurones

J. F. Storm

In this issue of The Journal of Physiology the properties and somatodendritic distribution of voltage-gated K⁺ channels in pyramidal cells of neocortex are systematically analysed in three papers: two companion papers by John Bekkers (JB) in Canberra (Bekkers, 2000a,b) and one paper by Alon Korngreen and Bert Sakmann (K&S) in Heidelberg (Korngreen & Sakmann, 2000). Both laboratories focus on K⁺ channels in one of the most remarkable cell types in the mammalian brain: the large layer V (L5) pyramidal cells. These are primary output cells of the cortex, with long apical dendrites that rise through most of the cortical thickness, receiving thousands of synaptic contacts and reaching lengths of nearly 1 mm in the rat (Fig. 1A).

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