Okay, let’s go deeper into the
parasympathetic nervous system.
Because the gut is a little bit different
in that it has both the parasympathetic
and sympathetic nervous system
and one that we haven’t
probably talked about much yet
and that’s called the
enteric nervous system.
Okay. So let’s first go
with the parasympathetic.
When you think parasympathetic
you want to think of
relaxing and digesting.
You’re going to increase secretions,
and you’re going to
you’re going to decrease the
constriction of various sphincters
and what sphincters do is allow for food
stuff to be held at certain points.
So if you decrease their constriction,
you’re allowing them to move
from one spot to another.
And finally, you increase blood flow.
If we look at the anatomy here,
you’ll notice that most of the
parasympathetic nervous system
is either involved with the brain stem such
as cranial nerves number VII, IX, and X.
You’ll also have some sacral nerves,
that plexus very close to the
particular nerve that is involved
for the small or large intestine
and sometimes even the stomach.