Nerve Supply – Anterolateral Abdominal Wall

by James Pickering, PhD

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    00:00 I have mentioned the nerves and again, these nerves are going to be running from the spinal cord in the vertebral column on your back and they are going to be running all the way round and these nerves run around in this direction to supply the musculature. Obviously, similar happens in both the male and the female. And this is just a cartoon of what this looks like. Here we have got the spinal cord and we can see coming off the spinal cord, we have these two pairs of spinal nerves. We have just got one here and one here.

    00:31 This happens all the way up and down the spinal cord. So, the spinal cord is divided into 31 segments and here, we are just looking at two of these segments giving rise to a pair of spinal nerves, one coming in this direction, one coming in this direction.

    00:46 As I mentioned throughout the lecture, the nerves that supply these muscles come from T7, T11, your thoracoabdominal nerves and subcostal nerve which is T12. This could be T12 here and then the one directly inferior to it could be L1. And importantly, what we can see is that these nerves are branching around. They run in between internal oblique and transversus abdominis muscle layers. But, we also have some cutaneous branches and these are going to supply the skin. And that?s what creates this banding, creates the dermatomes, the sensory distribution from the skin. So, when you touch, the sensation travels back towards the spinal cord. So, here we can see some of those thoracoabdominal nerves.

    01:36 Importantly, I mentioned when we looked at the muscles, the various movements of the trunk and here, we can just see where we have the various movements that these muscles contribute. So, we have lateral bending where you can see the trunk is moving on to the left and to the right moving laterally. You can see we have extension and you can see we have flexion carried out, let's say by rectus abdominis. This is similar to the sit up position.

    02:01 And then we have rotation where the body is rotating around, obviously. All of these muscles, all these movements are co-ordinated by some, if not all, of those anterolateral abdominal wall muscles, so important movements of the trunk.

    02:18 So, in summary, in conclusion, we have looked in quite a lot of detail about the origin, the insertion and the innervation of a whole series of muscles which we can see here, external, internal obliques, transversus abdominis and rectus abdominis, those important muscles.

    02:33 And how those muscles were arranged to form the rectus sheath. And then towards the end we have looked at the epigastric vessels, superior, inferior and the thoracoabdominal nerves that innervate them. And then finally, we looked at movement, the bending, flexing, extending and rotating of the trunk. These muscles are really important when we come next to look at the inguinal canal. The inguinal canal is an important passage way located in the inguinal region and these muscles form a complex channel that allows the important structures to pass through and we will look at that next.

    About the Lecture

    The lecture Nerve Supply – Anterolateral Abdominal Wall by James Pickering, PhD is from the course Abdomen.

    Included Quiz Questions

    1. T12
    2. T9
    3. T10
    4. T11
    1. Ilioinguinal and iliohypogastric nerves.
    2. Thoracoabdominal and subcostal nerves.
    3. Subcostal and ilioinguinal nerves.
    4. Subcostal and iliohypogastric nerves.
    5. Thoracoabdominal and iliohypogastric nerves.

    Author of lecture Nerve Supply – Anterolateral Abdominal Wall

     James Pickering, PhD

    James Pickering, PhD

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