Dermatomes – Surface Anatomy of the Abdomen

by James Pickering, PhD

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    00:01 So, finally, getting towards the end of this initial introductory kind of surface anatomy lecture, I want to show this picture which may look slightly bizarre, but on the...

    00:12 on this side here, we can see a male torso and what’s been drawn onto it are a series of horizontal bands like you are wearing a hoop to jumper. And these horizontal bands mark an area of the abdomen that is innervated by a specific spinal nerve and on this side, we can see that we have these individual spinal nerves which are radiating from the spinal cord. So, if we look here, we can see that we have these series of transverse bands.

    00:48 Here, we can locate them as T10, T11, T12, L1. These are the regions of the spinal cord that these spinal nerves originate from. And what we can see is that we have also superimposed various organs. So, here, we can see we have got a region here which is the stomach, we have got a region here which indicates the liver and the gall bladder. This is important because this is where these organs, if they become inflamed or if they become damaged, radiate their pain to these specific nerves and because the body is not used to feeling pain from the stomach or from the intestines because they are busy functioning, the body assumes it’s coming from that area of the skin which is used to feeling, you are used to touching your abdomen, so the brain is used to receiving sensation. So, it’s important, therefore, to understand where these organs refer their pain to the surface of the abdomen and we will explore this in later detail towards the end of this course.

    01:55 So, in conclusion in this initial introductory surface anatomy lecture, we have looked at numerous surface landmarks like the umbilicus, the xiphisternum, pubic symphysis and that important bone, the anterior superior iliac spine. We have then used these regions to locate specific reference planes like the midclavicular, midinguinal planes, subcostal, transtubercular and how these divide up the anterior surface of the abdomen into numerous regions like the hypochondria, epigastric lateral lumbar regions, umbilical, inguinal or pubic regions. And we have looked briefly at the position of some general organs within these specific regions, specifically looking at the appendix and the liver. And then towards the end, we looked again briefly, but we will come back to this throughout the course, the sensory distribution from the skin and also from the organs that lie deep to it.

    About the Lecture

    The lecture Dermatomes – Surface Anatomy of the Abdomen by James Pickering, PhD is from the course Abdomen.

    Included Quiz Questions

    1. Umbilicus
    2. Appendix
    3. Liver
    4. Clavicle
    5. Femur
    1. T10
    2. T11
    3. T12
    4. T9
    5. L1

    Author of lecture Dermatomes – Surface Anatomy of the Abdomen

     James Pickering, PhD

    James Pickering, PhD

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    By Abby B. on 13. October 2017 for Dermatomes – Surface Anatomy of the Abdomen

    I absolutely loved his teachings methods! Learning at it's finest for beginners!