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Nerve Supply – Small Intestine

by James Pickering, PhD
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    00:01 So we've looked at the stomach and we've looked at the autonomic nervous system that supplies the stomach; and how parasympathetic and sympathetic fibers control it.

    00:10 Well again the small intestine is controlled by these autonomic fibers.

    00:15 These parasympathetic and sympathetic fibers which we can see here. We have got the blood vessels left on, and in green you can see this spiraling mesh, this coblet of autonomic nerves.

    00:27 Again we will look at these in more detail later on with the individual organ lectures become very detailed and complicated. So we will look at the autonomic supply all together in a later lecture. But simply again the parasympathetic is going to have the effect of increase in the activity of the small intestine.

    00:50 So it’s going to increase the peristalsis through the small intestine. It’s going to facilitate blood passing towards the small intestine allowing for the nutrients to be absorbed.

    01:02 And this again is done via the vagus nerve, the parasympathetic input, specifically the posterior trunk.

    01:09 Sympathetic is going to be associated with decrease in activity.

    01:13 So for example if you are running a marathon, you want to direct that blood to your muscles so they can carry out their function. You don't want to have a lot of blood passing to the small intestines.

    01:26 You want to direct that blood for oxygen, for nutrients going towards the muscles.

    01:31 So the sympathetic part of the autonomic nervous system for the small intestine is going to reduce its activity. And this is carried out again by some splanchnic nerves greater, lesser, least.

    01:42 We will look at those in later lectures in more detail.

    01:45 And they form what’s known as the superior mesenteric plexus. This is a hub of nerves that surrounds the superior mesenteric artery and these nerve fibers pass towards the small intestine via the arterial supply and they circle periarterial branches.


    About the Lecture

    The lecture Nerve Supply – Small Intestine by James Pickering, PhD is from the course Abdomen.


    Included Quiz Questions

    1. Ascending
    2. Descending
    3. Superior
    4. Inferior
    1. Greater in diameter
    2. Pinker in colour
    3. Higher quantities of fat in its associated mesentery
    4. A reduced blood supply
    1. Posterior trunk of the Vagus
    2. Anterior trunk of the Vagus
    3. Coeliac plexus
    4. Superior mesenteric plexus
    5. Inferior mesenteric plexus
    1. Causes the relaxation of sphincters
    2. Slows down peristaltic movements in the gastrointestinal tract
    3. Causes the contraction of sphincters
    4. Decreases the production of secretions
    5. Reduces the activity of the gastrointestinal smooth muscles

    Author of lecture Nerve Supply – Small Intestine

     James Pickering, PhD

    James Pickering, PhD


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