all right i did this video once before but it came out so crappy i'm doing it again so here you've got the heart of course this is a cat ribs have been removed now this has already had [Music] the parietal pericardium partly cut and reflected back see if i can get it with my forceps here this bag-like membrane around the heart that is the parietal pericardium you couldn't see it on a preserved heart so that means this surface would be the visceral pericardium i'll move the lungs out of the way most of this is ventricle you can see the interventricular sulcus a bit so i got a left ventricle and a right if i remove the membrane a little more you can expose the atria this little bag like structure at a top here this is the right atria and the left one kind of gotta roll the heart a little bit there you'll see the left atrium that little thing right the tip of my finger there coming out of the right ventricle you can see a bit of the pulmonary trunk coming out here so this is the pulmonary trunk now the veins let me tuck the lung out of the way a little bit they're pretty easy to see they've been injected with blue latex so leading down into the right atria this is the superior vena cava from here the atria all the way up to this branch point it's the superior vena cava you can also call it the anterior vena cava which is more accurate in a cat and sometimes it's called the cranial vena cava either one will work if you lift up the heart a bit you should be able to see a bit of the inferior vena cava right there a little bit of that now i'll do i'll follow kind of go upstream with the blood so here's the super vena cava these two splits you've got one here on the right side one here on the left side they're basically mirror images for the most part with the venus system so you'll notice usually one half of the cat comes out better than the other like i'm missing some injection up here so i'm going to stick with the right side just keep in mind left side be about the same so this first branch so here's the vena cave it splits into the left and the right kind of between the tips of the forceps there that's the left and the right brachiocephalic vein that's a term we're using you may see it called i think the innominate vein in some books but we're brachiocephalic vein it's receiving blood from the arms and the head that's the brachiocephalic part then this will split right at this point you'll have about three branches this one big branch going up if you follow it up it goes up the outside of the neck on the right side that is the external jugular the internal jugular is not present or not injected in many cats it would have branched off here and it would run much deeper almost right where the carotid artery is there so that's the external jugular then this branch right here for about a quarter inch just as it's kind of leaving the rib cage that's the subclavian vein right subclavian it'll come out and it will split usually into two branches this one kind of hanging out in the armpit here that's the axillary vein now so subclavian for about a quarter inch and then it's axillary when it's in the armpit so subclavian just a little bit axillary there kind of hanging in your armpit and i'll be pretty sure i'm i'll be pretty far down on the arm like right here then it becomes the axillary becomes brachial and it's on the arm and if you follow it down just before the elbow you'll see it split there you go those two main branches one goes towards the thumb that's a radial vein and the other one right there towards kind of the pinky side of the arm that's the older vein that's as far as we'll go with the veins the other branch kind of coming down here in the middle if you follow it down it's going straight back towards the shoulder blade the scapula so that is the sub scapular vein and that's about all you need for the veins now the arteries all right we got the pulmonary trunk there and kind of coming out behind it you can see a bit of the aorta get myself arranged here so this curved piece here is the aortic arch and then from here we're all the way down to the legs that's basically descending aorta while it's in the thoracic cavity then you might see it called thoracic aorta in the abdominal cavity abdominal aorta in the first bit be about an inch long in a human it comes straight up out of the heart is ascending but it's like way down here i don't usually ask ascending on the cat i'd use a human heart model but this curve bit here that's the aortic arch now the cats have two branches off the aortic arch one there one there on its right side usually a little bit bigger that is a brachiocephalic trunk or brachiocephalic artery and if we follow it up pull it out here so i'll grab the brachiocephalic trunk you can see kind of looks like a little chicken foot there it splits into three the three branches are this is hard to do one-handed get myself in there a little better the three branches are one here sorry one here one in the middle and one on the far right so you can see the three branches there i think the one on the left this one right here so the leftmost branch of the brachiocephalic trunk is the left sub uh left common crowded sorry if you follow it up it'll go up the inside of the neck here and you'll be able to see it right about there it is a little further up that is the left common carotid the middle branch right here if you follow that one up that is the right common carotid you can see it again up here by the trachea so that was the middle branch and the branch to the right let me catch it that one there it's kind of going under the vena cava here that is the right subclavian it will go behind the vena cave in most cases and you'll see it coming out here that's a rib right there and once you leave the rib cage just like the vein that's now the axillary artery and then when you're down on the arm it will just follow the veins there you can see that little red one running right next to the brachial vein is a brachial artery and it will split into radial and ulnar but they get so tiny i may have that on your list but i don't ask brachial and or radial ulnar arteries on the caps too tiny i could barely get a pin in them then the only other one we need to worry about back up here at the aortic arch the second branch so that was the first brachiocephalic trunk then this one is the second branch up theoretic arch in most cats that one is the left subclavian all by itself and you'll follow it up once it leaves the rib cage here's a rib so we're out here it becomes axillary and then brachial radial owner like everything else um that's more or less it so i'll post this up and you can use it to study if you like or ignore it take care