And then, these wings here, these part,
this part of the neuroectoderm actually contains these migratory cells.
These are, are cells on the march, they are going places.
They go all over the body.
And so they are actually are going to form the peripheral nervous system.
So the peripheral nervous system is formed by the migratory cells out here
which are called neural crest cells, okay.
So, let's just look at that in situ.
So the, neural tube is going to form the brain and the spinal cord.
And the neural crest, I'm going to reverse my colors here, neural crest
is going to form three different types of cells, sensory cells,
that sit out here and send information into the central nervous system.
So the second part of the peripheral nervous system
are these autonomic ganglia neurons.
And these are neurons that innervate things like sweat glands and
hair follicles and the heart, and the the air ways, the, the lung, the bronchi.
And do things that we're not in conscious control of, such as sweating,
piloerection, speeding up our heart rate or slowing down our heart rate.
And these all come from the autonomic ganglia.
And we'll look at them a bit more later.
And the third piece of the peripheral nervous system is called
the enteric nervous system.
We're going to look at that in the next slide.