The important point about these nerves in the spinal nerves
is that they all are very stereotyped.
They all have a both a sensory and a motor component.
So in every spinal level,
the nerves that go out from every vertebral level, there is
information coming in, sensory information coming in and motor information going out.
And the nervous system is set up sort of logically so if you look at a person and
here are the legs and here are the arms.
This is the spinal cord, this part of the spinal cord is going to enervate the neck.
And then below that is going to be where it innervates the arms.
And then it's going to be the sake of, or I'm sorry, the trunk.
And then it's going to be the legs.
There's not going to be a situation where this,
the top of the spinal cord, innervates something out of order.
So it's all topographic.
[COUGH] Okay,
now the situation in the cranium is a little bit different.