all right this is a model of the heart and you can appreciate how the heart is divided into four chambers we have the right atrium the left atrium the left ventricle and the right ventricle so we can kind of open it up a little bit like this actually let's begin however by closing the heart up you can appreciate how the right ventricle is blue in this particular model to indicate that it's deoxygenated blood that's traveling to the right side of the heart um the left side of the heart however gets Deo gets oxygenated blood and why this is orange we'll never know but nonetheless it is oxygenated blood um as opposed to Blue right okay good all right well let's take a look first at maybe a few grooves that we have around the heart in the in the area of the cardiac skeleton is a Groove between the Atria and the ventricles and this is referred to as the atrial ventricular Groove there's also a Groove in the region where the wall between the two ventricles lies you can appreciate that this is a wall between the two ventricles we call this the inter ventricular septum and likewise where the septin exists we have a Groove that these blood vessels rest in and therefore this is the interner ventricular sep uh septum with the in ventricular Groove so the groove is is the inner ventricular Groove all right well let's take a look at some blood vessels so I'm going to begin by taking this heart model off let's look at the big blood vessel first this great big one is the aorta this is essentially sending uh oxygenated blood throughout the body and of course it's arising from the left ventricle um this large vessel in front of it is also an artery Believe it or not in spite of the fact that it is blue and this is referred to as the pulmonary trunk the pulmonary trunk is going to be branching into two pulmonary arteries a left pulmonary artery and a right pulmonary artery now notice that these pulmonary arteries are blue Right In Color which means that they are transporting deoxygenated blood but they are arteries by definition because arteries send blood away from the heart so so both the aorta and the pulmonary trunk are arteries likewise veins send blood to the heart here's a very large vein and another very large vein and these two collectively are called the vnea this would be the superior vena this is the inferior vnea again blood is brought to the heart via veins now blood is coming from the lungs to the heart on the left side so we also have veins on the left side but these veins are red because the blood coming from the lungs is oxygenated blood and so these would be the pulmonary veins so there's two here on the left side draining into the left atrium and there's two on the right side also draining into the left atrium okay good well let's talk about the blood uh vessels that feed the heart itself feed blood to the heart itself and drain the heart let's begin by looking at two that are associated directly with the aorta so coming off the aorta is this one on the right side simply called the right coronary artery and then there's a little stubby one on the left side called the left coronary artery the left coronary artery is going to Branch into two arteries this one going around the heart is the circumflex artery again that's the red vessel and the one going down here in this in inter ventricular Groove the red one is the anterior uh inter ventricular artery um if we take a look down here this right coronary artery persists all the way down and we have an artery that kind of goes off the side of the heart here we're not going to be bothered with these others who knows what they're supposed to be but this particular one is the marginal artery so this particular artery at the base here is the margin marginal arter really not the base of the heart this is going more toward the Apex the point of the heart but I'm just referring to the series of arteries that' be at the base of them right and so um this again is the marginal artery all right now let's take a look at the veins and probably the best way to look at the veins that essentially uh take blood from the heart muscle be at the back of the heart we have a very large vein here and actually if we follow that all the way from the front let's do that first so this is a very large vein travels from here all the way around following the circumflex artery all the way around to essentially draining in this big bulge and this large vein is called the Great cardiac vein likewise there's one that follows the back of the heart in the interner ventricular septum at the ba back of the heart and so this is going to be referred to as has the middle cardiac vein and then there's the small cardiac vein all three of them drain into this large bulge which we referred to as the coronary sinus the coronary sinus now the coronary sinus drains deoxygenated blood back into the left I should say the right side of the heart and it goes here right there into the opening of the coronary sinus as it's draining into then the right atrium okay good notice too that the great the small and the middle cardiac veins seem to form sign of kind of a Fancy TE can you see the T of course all of them are going to have a a convergence here um right there at the coronary sinus good all right now as there is an anterior ventricular artery in the inter ventricular sulcus there's also a posterior uh inter ventricular artery right here and of course it's going to be joining with the circumflex artery and uh this of course is the right coronary artery here coming around the back all right good well let's take a look now at some valves