 What do you see in front of you? On my left hand is the right lung which has been harvested from this canaver here And on my right hand is the left canaver left lung, which has also been harvested from the same canaver In my previous resection series. I had been described the right lung now. I'm going to describe the left lung I'm going to quickly mention Those features on the anterolateral surface in the posterior surface of the lung and the features on the medial on the medial surface of the lung By the way, I'm Dr. Sanjay Sanyal. I'm the professor and course director of this Anatomical Sciences here and the camera person is Mr. Doug McLaren So this is the left lung. Let's take a quick look at some of the salient points here The first thing which comes to our attention is this fissure here This is the oblique fissure The oblique fissure it cuts the inferior margin of the lung at the level of the sixth cost of cartilage It goes posterior superiorly up and it goes to the medial surface from the top as it is from the bottom And I shall show it to you when I come to the medial surface Next point What are the parts of the lung? This is the apex of the lung This apex of the lung is the one which fits into the Goes just above the rib and fits under the suprapleural membrane or the sips and spacia This is the sharp anterior border of the lung which fits into the costo-mediastinal recess When we trace the anterior border of the lung We notice a notch here This is the cardiac notch Because of the presence of the heart, which I'll tell you later and just with the cardiac notch There's a tongue shape process here, which is known as the lingula or the lingular process The word lingula is derived from the Latin word which means the tongue This is the sharp inferior border And this depression is the inferior surface of the lung which fits into the onto the left dome of the diaphragm We additionally see some Parallel depressions Especially on the anterior surface These are the rib markings for the costal markings produced by the respective ribs on the left side This is the posterior border of the lung which is blunt because it is in relation to the vertebrae So these are the salient landmarks. What do you see on the surface? This is actually covered by the visceral blura and the lung is supposed to be normally Pink in color like in this one, but we can see a few black markings These are actually the macrophages have tracked the carbon particles from the polluted atmosphere If this person had been a smoker, then this lung would have been completely black Mercifully, it's not Okay, now let's come to the medial surface or the mediastinal surface. Remember, this is the left lung The first thing which tracks our eye Is what I had mentioned earlier oblique fissure The oblique fissure comes into the medial surface and it meets this region of the lung which is called the hylum It meets it from the anterior inferior aspect and likewise the same oblique fissure It goes up near the apex of the lung and again meets the hylum from the posterior superior aspect So these features are pretty much the same as the right lung which I described earlier The only significant difference being that unlike the right lung there is no middle fissure Therefore, the right left lung has got only a superior low and inferior low There is no middle low So the superior low is in relation to the anterior part of the chest wall and the inferior low is in relation to the posterior part of the chest wall because of the obliquity of the oblique fissure This is of clinical significance when we are escalating the back of the chest We are actually hearing sounds in the inferior low and when we are escalating the front of the chest We are hearing sounds from the front We are hearing sounds from the superior low. Okay, let's come back to the medial surface The next thing that we notice is this structure here, which is pretty much the same as the structure which I've shown you on the previous lung This is the hylum of the lung and just like the previous it contains the same three vascular structure neuro bronchovascular structures Namely the left principal bronchus and you can feel it by its cartilaginous feel The pulmonary vein and the pulmonary artery Additionally, we can see a few black spots here Those are the macrophage carbon particle laid in bronchopulmonary lymph nodes This is the same region where the medial canal part of the parietal plura becomes continuous with the visceral part of the plura the visceral plura of the lung and just like the previous There is a sleeve of double fold of plura which hangs down from the hylum and this is known as the pulmonary ligament Okay, having said that now. Let's come to a few quick other parts of the lung. Again. We see this big depression here This depression again is the cardiac depression This is related to the left pulmonary surface of the heart and this is produced by the left ventricle And therefore left ventricle being a very large organ. It has produced a very big depression. Okay The next thing that we notice is this curvilinear Groove and you have already guessed it. This is the arched aorta and the descending thoracic again, just like the previous this Shallow depression that you see here and this depression. This is related to the left subclavian artery This is related to the trachea and to the isophagus and the same isophageal marking then continues down like this So therefore the isophageal relationship is there both in the right lung as well as in the left lung So these are the salient findings that we see on the medicinal surface of the left lung Thank you very much for watching ladies and gentlemen If you have any questions or comments, please put them in the comment section below. Dr. Sanjay Sanyal signing out. Thank you Doug