Coronary Arteries | Cardiology

[Music] I've run dr. Mike here in this video we're gonna look at the coronary arteries so remember the heart as a muscle it may contract and pump blood around the body and the lungs to feed it give it oxygen given nutrients but remember the heart itself needs oxygen and nutrients and it gets it via the coronary arteries so that means the heart does not just pull oxygen and nutrients from within it actually needs its own dedicated blood supply again these are the coronary arteries now there's two major branches of coronary arteries there's the left and right coronary arteries and you can see that both of them come out at the trunk of the aorta here's the aorta here those three superior branches coming off and you can see that you've got the left coronary artery and the right coronary artery coming out now the important point is when the left ventricle contracts and pushes blood out via the aorta when that left ventricle relaxes called diastole systole is contraction pushing blood out relaxation is diastole in relaxation when the heart relaxes the blood wants to fall back down but it gets caught by what we call the aortic semilunar valves now when the blood gets caught in the air I oughta xmu Learner valves that's when the blood drains out by these coronary arteries this is important because it's very different to the way other vessels feed tissues they feed them under systole here the heart is being fed under diastole now as the left and right coronary arteries are receiving blood let's just focus on the left coronary artery okay now what we can see is the left let's label this we've got the left coronary artery and the left coronary artery continues down and as you can see there is the first major branch that comes off at the front now this front branch and anterior branch descends down and this anterior descending coronary artery which is what it's called goes down the interventricular septum now this is a septum this is an area that separates the left ventricle area from the right ventricle area heads been the intern ventricular septum in actual fact you've got the two atria two ventricles you've got the atrial ventricular septum down here also nose the atrioventricular sulcus and you can see that both the left coronary artery and the right coronary artery moves down the atrioventricular sulcus now with the left coronary artery we've got that first anterior descending branch that goes down the interventricular septum and it's called the left anterior descending coronary artery let's label that that's called the left anterior descending coronary artery the lad let's write the full word out left anterior descending coronary artery also known as the anterior descending coronary artery or the anterior interventricular coronary artery I know there's a lot of names but it's okay just remember the lad left anterior descending as we can and I'll tell you what it feeds in a second now as we keep going down the left coronary artery we spoke about that first branch that first left anterior descending you can see goes all the way down to the apex of the heart and then moves behind the heart you can see that the lad moves behind the heart and feeds the majority of the interventricular septum and the majority of the left hand side the left atrium and left ventricles the muscle of that left hand side so the lad is very important as we continue with the left coronary artery we've got the circumflex artery so this is a branch called the circumflex which goes around the back circumflex and the circumflex coronary artery you can see moves behind the heart and feed some of the musculature behind the left-hand side of the heart then a branch of the circumflex here is what we call the marginal artery or the left obtuse we'll called the left marginal artery and you can see it goes down the margin on the left-hand side of the heart feeding the musculature of that left ventricle okay so what we've got are these for the left coronary artery these are the three major arteries I need you to know it's the lad left anterior descending the circumflex and left marginal most important point here is the lad because it feeds most of the left-hand side of the heart most of the left musculature of the heart it's the most important when it comes to a heart attack if there's a blockage of the lad most of left hand musculature will die off okay and this is going to lead to a myocardial infarction with increased risk of death all right very important now if we look at the right coronary artery let's label that right coronary you can see that the right coronary actually flipped behind the heart as well and you can see it moves behind the heart but before it moved behind the heart hit up it had another branch and this branch is the right marginal artery so we had a left marginal artery now we've got I should probably write the correct side right marginal artery here's the left marginal go down the left margin here's the right marginal going down the right margin feeding the musculature of the right margin of the heart the left the right coronary which branches behind has an important branch at the back here this was the anterior descending this is the posterior descending now you can see that the posterior descending coronary artery may join together with the left anterior descending coronary artery and that's called an anastomosis an anastomosis is where blood vessels join together okay now this is common for us to have it unless the mostess here from the posterior descending and the left anterior descending at the back of the heart it's more common in those people who have coronary artery diseases because if there's a blockage somewhere you want to increase the likelihood that the whole heart gets fed so coming together and joining is to your benefit okay reduces risk of myocardial infarction okay so what are the coronary arteries you need to remember for the left hand side you've got the circumflex the left marginal and the left anterior descending this is the most important for heart attacks for the right coronary artery we'll get the right marginal and the posterior descending and you may have an anastomosis at the back so this is a quick run-through of the coronary arteries

Channel: Dr Matt & Dr Mike

Views: 155,205

Keywords: coronary arteries, coronary, arteries, blood flow to the heart, left anterior descending, anterior descending, anterior interventricular, left coronary artery, right coronary artery, marginal artery, oblique artery, circumflex artery, heart, cardiology, nursing anatomy, a&p, medicine, nursing

Id: F51Tg_KNrKY

Length: 6min 34sec (394 seconds)

Published: Mon Jul 08 2019