Motor neurons in this system do not reach their targets directly (as do those in the somatic system) but rather connect to a secondary motor neuron which in turn innervates the target organ. Click here for a diagram of the Autonomic Nervous System. Full article >>>
So the motor neurons that we study express some very specific genes. One gene is called Eyelet 2, and then other motor neurons express a related gene called Eyelet 1. Full article >>>
On the other hand, specification of these same Gli2 independent cell types (V2 interneurons and motor neurons)"but not of floor plate cells"can be restored in Shh mutant embryos by the removal of Gli3 activity (Litingtung and Chiang 2000). Full article >>>
Researchers at the University of Wisconsin-Madison coaxed humanembryonic stem cells into becoming neuralstem cells, then into the beginnings of motor neurons before finally differentiating into spinal motor neuroncells, the cell type that, ... Full article >>>
Two examples are spinal motor neurons with dendritic arbors of a few millimetres in diameter, and retinal amacrine cells, with arbors of only few hundred micrometers in diameter. Full article >>>
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