Unlike deep-layer pyramidal neurons,
the collaterals of superficial pyramidal neurons have an interesting "express
train" patterning, with no "stops" except in clusters separated
by about 0.5 mm (varies with cortical area). They also have many terminations
locally, presumably to other pyramidal neurons in the same dendritic bundle.
The overall pattern is like that of a focussed
flashlight beam, a hot spot in the middle and then a bright ring about
0.5 mm away.
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An animated supplement to William H. Calvin's THE CEREBRAL CODE.