 Now we're talking about just visceral motor. So this time we're going to compare and contrast our two different visceral motor pathways. Let's start with the dark green because they are dark green in your body, right? The dark green pathway is a parasympathetic pathway. And parasympathetic pathways, most of the time, in general, not always. But in general, we remember parasympathetic pin and pinna, parasympathetic pathways because they cause you to rest, relax, feed, breed. Basically, parasympathetic pathways are like, dude, let's all chill out. Remember that all of our visceral motor pathways are the same effectors. So for example, your heart, when it's innervated by a parasympathetic pathway, it'll slow your heart rate. Things will get more mellow. Your blood pressure will drop. Your heart is also innervated by the light green pathway. I'm going to be cool if you were color coded like this. The light green pathway is the sympathetic, the sympathetic nervous system, or the sympathetic response. And this is basically fight, flight, fight, run away, or say, oh, bad word. That was very disciplined of me. Are they anatomically similar? They have anatomical similarities. What are some of the characteristics that they have in common? Check it out. They both are two neuron series. My little red one is what they have in common. They both have a what? They both have an autonomic ganglion. What do you notice about my ganglia? My autonomic ganglia. Here's one. Here's another one. Are they in the same location? Not so much. The first neuron in the series in both situations is considered a preganglionic neuron. Does that make sense to you? The cell body is going to be found in the lateral gray horn of the spinal cord. The axon is going to travel out through the anterior root up through the spinal nerve and then out into the body. The preganglionic neuron is going to synapse with what are you going to call the next neuron? If this one was preganglionic, the next neuron is going to be my ganglionic neuron. Because where did the ganglion come from? A ganglion is a group of cell bodies. So the ganglionic neuron is responsible for the ganglion. Does that work for you? This is my ganglionic neuron. Where's my ganglionic neuron in my light green pathway? Here's my ganglionic neuron. There's my ganglion preganglionic neuron. Oh, ganglionic neuron. Who does the preganglionic neuron synapse with? Here's my synapse. It synapses with the ganglionic neuron. Who does my ganglionic neuron synapse with? The effector. Who does this ganglionic neuron synapse with? The effector. How great is that pattern? What do you notice about preganglionic neurons? All of them. Look, all of the preganglionic neurons are wet. Myelinated. What do you notice about the ganglionic neurons? They're naked. There's no myelin there. Poor little buddies. Do you think they feel sad when they put cool yellow pants on? I'm sure they do. What else? I think that's everything. Okay, next. Now we're going to look just at the sympathetic pathway. And we're going to dive in even crazier to look at what's cool about the sympathetic nervous system anatomy.