If we look at the nerve supply again, then
the nerve supply of this region again is a little bit complicated
because it forms this transition between the
superior mesenteric plexus and
the inferior mesenteric plexus.
And these supply different regions
of the large intestine. Now we will really
concentrate on this when we move on the lecture 20
at the end of the course which really focuses
on the autonomic nervous system.
But for now we can appreciate that
for the large intestine, the parasympathetic
input is going to increase
activity. It's going to increase the activity
just like the parasympathetic input increase
the activity of the other GI organs. And the sympathetic
part of the autonomic nervous system
is going to decrease the activity.
And here we can see it's been
carried out by the whole number of
the plexuses, the superior and
the inferior mesenteric plexuses.
The main parasympathetic input is via
the pelvic splanchnic nerves. This is primarily
for this kind of distal portion of the large intestine.
There are still some vagal input
into the more proximal regions of the large intestine.
But like I said, we will explore this in more detail
in a later lecture.