In this case we have a long pre ganglionic and a short post ganglionic. Here we have a short pre ganglionic and a long pre ganglionic. In the sympathetic case it always begins in a spinal cord while in this case it begins either in the brain or in our spinal cord. Now, in the parasympathetic case we always have a pre ganglionic and opposed ganglionic neuron. In the case of the sympathetic we usually have a pre and opposed ganglionic. But in the case of the signal being transferred into our adrenal medulla we only have a single neuron.