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In Situ View – Heart (Cor)

by Craig Canby, PhD
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    00:01 Welcome to this lecture on the Heart. This is one of my favourite topics in anatomy because the heart is such an incredible organ. We really don?t pause and consider how astonishing the heart is but it?s been estimated that the amount of work that the heart does in one?s lifetime is equivalent to lifting 30 tonnes to the top of Mount Everest.

    00:28 This is coming from a muscle mass of about 300 grams, a little more in the male perhaps a little less on average in a female. But the heart does all this work throughout our lifetime without taking much pause to rest. An incredible organ. And so please join me on this tour of the heart.

    00:53 And as we go on this tour through the heart, at the end of this lesson you should be able to answer the following objectives: describe the pericardium and how the pericardial cavity and sinuses are formed; compare and contrast the anatomy of the four cardiac chambers; list the great vessels and the cardiac chambers that receive them or issue them; describe the sulci, surfaces, base and apex of the heart; describe the cardiac valves with regard to location and number of cusps; describe the coronary circulation with regard to dominance and arterial distribution and then venous drainage. The last objective you should be able to answer is: to describe the cardiac conduction system and the clinical relevance of Koch?s triangle. And then our summary slide will identify key messages that you should take home from this lecture. And then the last slide will provide attribution for the images that were used towards this presentation.

    02:16 This slide is demonstrating the body map. We have a young, well-developed male. And our focus will be on the anterior view to the left. And the topography of the heart is going to be in this general location. And so if we peel back the thoracic wall ? the anterior thoracic wall ? we then can take a look at how the heart is arranged within the thoracic cavity.

    02:52 Here we have an in situ view. So please take a look at where the heart is. It is located in this area. It?s in the middle of the thoracic cavity with the right and left lungs to either side of it.

    03:08 It is housed or enclosed within a pericardial sac. And there are three components that make up this sac. But here in this view ? in the in situ view ? you?re seeing the fibrous pericardium surrounding the heart. The fibrous pericardium is attached to the diaphragm.

    03:30 So what that means is, with respiratory movements, the heart will move with the diaphragm down and then up, down and then up. And then the specific location within the thoracic cavity is the mediastinum ? that area that lies in the centre ? and the specific area of the mediastinum that houses the heart and the pericardium is the middle mediastinum.


    About the Lecture

    The lecture In Situ View – Heart (Cor) by Craig Canby, PhD is from the course Thoracic Viscera.


    Included Quiz Questions

    1. The heart moves up and down
    2. The heart rotates
    3. The heart stays stationary
    4. The heart moves mesiodistally
    5. The heart moves superficially

    Author of lecture In Situ View – Heart (Cor)

     Craig Canby, PhD

    Craig Canby, PhD


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    During respiration
    By Alexandra J. on 15. October 2017 for In Situ View – Heart (Cor)

    I was going to give it a five stars but in the lecture you said during respiration the heart moves down and up but in the quiz the right answer was up and down..