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Chambers and Great Vessels – Heart (Cor)

by Craig Canby, PhD
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    00:00 When we look at the chambers and great vessels of the heart, we?ll begin here with the chambers themselves. But the heart is going to have two upper chambers ? and we?ve referred to those as atria. And the heart will have two more muscular chambers, which are the main pumping chambers of the heart, which are called the ventricles.

    00:26 If we take a look at what we have here in this image, please take a look very closely at the right atrium in through here. We see it very, very well. This rounded portion of the right atrium is called the auricle, or right auricle, of the right atrium. And then, over here, we have the auricle of the left atrium. We do not see in this view very much of the left atrium and we?ll have another opportunity here to see it in greater detail.

    01:05 Please note, please do not interchange atrium with an auricle.

    01:12 An auricle is a part of an atrium.

    01:18 The main muscular chambers are shown down in through here. This would be your right ventricle. And then if you look over here, you see a portion of the left ventricle.

    01:35 Great vessels are going to be attached to the chambers of the heart. When we do an accounting of the great vessels, we?re going to come up with a total of 8. So you?ll want to keep in mind how many of these are veins and how many of these are arteries. You?ll also want to keep in mind where the veins empty and what chambers issue the arteries.

    02:10 So if we take a look, let?s focus on the veins first. There are six veins and only two arteries. And veins are going to empty into the atria.

    02:21 If we look at the right atrium, we see in this view one of those veins. This is the superior vena cava. If we go to the view down and to the right, you will then be able to see not only the superior vena cava, again emptying into the right atrium, but here you can appreciate the inferior vena cava emptying into the right atrium.

    02:52 You may be aware already that most of the inferior vena cava resides within the abdominal cavity and then it will pass through the caval hiatus in the diaphragm. And then there to meet it once it enters the thoracic cavity is the right atrium. So the inferior vena cava is a very short vessel within the thoracic cavity. So that takes care of two of our six veins.

    03:20 The other four veins are going to empty into the left atrium. And we see those four veins here, here, here and here. And two of the veins are coming from the right lung and the other two pulmonary veins are coming from the left lung. So here are your right superior, right inferior pulmonary veins. And then here are the fellow veins from the left: left superior pulmonary and then your left inferior pulmonary.

    03:57 Arteries are going to receive blood ejected by the ventricles. The right ventricle will pump blood into the pulmonary trunk, which we see here, and then your left ventricle will pump blood into the aorta and specifically the ascending aorta.

    04:18 Now let?s take a look at the surface anatomy of the heart. And we?re going to begin with the sulci. These are very important landmarks in that they?ll separate the atria from the lower chambers, the ventricles. And then other sulci will separate the right ventricle from the left ventricle. And so a surgeon can look very, very quickly at one of the sulci to determine whether or not he?s looking at the right ventricle or if he is looking at the left ventricle.

    04:56 But if we take a look here, let?s look at a sulcus. Here we see it in the anterior view.

    05:03 This sulcus will continue to the diaphragmatic aspect of the heart and will separate the atria from the ventricles. This sulcus forms a crown around the heart, hence one of the names is the coronary sulcus. And a more descriptive terminology anatomically is that, since it?s between the atria and the ventricles, we can also refer to it as the atrioventricular sulcus.

    05:35 Another sulcus is running right along here. And this is referred to as the anterior interventricular sulcus. And it will then continue inferiorly, wrap around toward the diaphragmatic aspect of the heart, as we see here, and be seen on its diaphragmatic surface.

    05:59 In the anterior view, this is the anterior interventricular sulcus. In the diaphragmatic view, it is referred to as the posterior interventricular sulcus.

    06:12 All these sulci contain variable amounts of fat. So you see some fat here in the coronary sulcus. You see some fat also here in the anterior interventricular sulcus. A little bit more sparse here in the posterior diaphragmatic view. And you?ll also find the major coronary vessels.

    06:36 So if we take a quick look here back in the coronary sulcus, the coronary artery that?s running through the sulcus in this view is your right coronary. And then you can see one of the branches here in the anterior interventricular sulcus from the left coronary. And you can see in the posterior diaphragmatic view, you can also see some of the components of your coronary circulation. And we?ll speak in greater detail about the coronary circulation shortly.


    About the Lecture

    The lecture Chambers and Great Vessels – Heart (Cor) by Craig Canby, PhD is from the course Thoracic Viscera.


    Included Quiz Questions

    1. Six veins.
    2. Six arteries.
    3. Two veins.
    4. Four arteries.
    5. Four veins.
    1. Superior venacava empties into the right atrium.
    2. Superior venacava empties into the left atrium.
    3. Pulmonary veins empty into the right atrium.
    4. Inferior vena cava empties into the left atrium.
    5. Pulmonary vein originates from the left atrium.
    1. Aorta receives blood from the left ventricle.
    2. Aorta receives blood from the right ventricle.
    3. Pulmonary trunk receives blood from the left ventricle.
    4. Right ventricle contains oxygenated blood.
    5. Pulmonary veins contain deoxygenated blood.
    1. 4.
    2. 1.
    3. 2.
    4. 3.
    5. 5.
    1. Pulmonary artery
    2. Aorta
    3. Left anterior descending coronary artery
    4. Left circumflex coronary artery
    5. Pulmonary vein

    Author of lecture Chambers and Great Vessels – Heart (Cor)

     Craig Canby, PhD

    Craig Canby, PhD


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    Amazing video!
    By Neuer N. on 02. September 2017 for Chambers and Great Vessels – Heart (Cor)

    I am a thirteen year old girl who wants to become an MD when I grow up, and I've been studying anatomy independently for about half a year, and lecturio helps me so much! This lecture is very in-depth and explanatory, if you want to learn about the heart then you should watch this video!