In the case of the somatic nervous system the target organ is always our skeletal muscle. So in the somatic nervous system the dendrites and the cell body of the motor neuron always begin, always originate in the spinal cord. So let's take a cross section of the spinal cord as shown in the following diagram. We have the white matter and we have the gray matter. So the cell body and the dendrites of the motor neuron in the somatic nervous system always begin within our spinal cord. So let's suppose I want to actually move my bicep.