In Situ View – Large Intestine

by James Pickering, PhD

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    00:00 And it's vital in the compaction and storage of faeces. So let's go onto explore the anatomy of the large intestine. We see this diagrams before immolation to the small intestine. And once again we can see that we have the greater omentum which is hanging, it is hanging from the transverse colon which we can see here. And the greater omentum this apron-like structure is hanging from it. Removing the greater omentum reveals again parts of the Jejunum and Ileum in the central region.

    00:29 And we can also now pickup the underside of the transverse colon here and we can also see the ascending colon. So food is going to be traveling up in this indigestible remnants of the ingested foods is going to be passing up in this direction then it will go across ultimately descending down in this direction.

    00:48 So it's following that inverted "U" shape.

    00:52 If we move on to the second series of diagrams, which again we have seen before this time we have mobilized the small intestine, which is possible because of the mesentery.

    01:03 And again in this diagram here we can see that we have this ascending colon.

    01:07 We can see the junction of the Ileum and the large intestine here this is the ileocecal junction. And we can also see that in this region below the ileocecal junction we also have the cecum and then this blind pouch the appendix. Again the ascending colon, transverse colon over in this direction, the spleen would be positioned up here. So this is where we have the Splenic Flexure. And then the Splenic Flexure is the point where the colon starts to descend and we have the descending colon running in this direction.

    01:41 We then have a piece of the colon that is mobilized like the small intestine.

    01:46 This piece of colon also has a mesentry and here we can see we have the sigmoid colon. Just here we have what's known as the sigmoid mesocolon.

    01:56 I will explore these colon, these mesocolons and mesentery in more detail later on. But we can see the sigmoid colon here as a mesentery is then continuous with the rectum. Another parts of the colon also has a mesentery attached to it. And that is the transverse colon here.

    02:15 And this membranous shelf which we can see here when the transverse colon is elevated, is the transverse mesocolon.

    02:23 And these are the two parts of the large intestine that have a mesentery attached to them, the transverse colon and the transverse mesocolon and the sigmoid colon and the sigmoid mesocolon.

    02:37 These give these regions greater mobility. The appendix attached to the cecum also has a small mesentery, the meso-appendix. But like I said, I will explore these mesenteries in a later lecture.

    About the Lecture

    The lecture In Situ View – Large Intestine by James Pickering, PhD is from the course Abdomen.

    Included Quiz Questions

    1. Right inguinal
    2. Left inguinal
    3. Right lumbar
    4. Left lumbar
    1. Transverse and sigmoid
    2. Transverse and ascending
    3. Transverse and descending
    4. Transverse and cecum

    Author of lecture In Situ View – Large Intestine

     James Pickering, PhD

    James Pickering, PhD

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