 Okay, so we're looking at the internal anatomy here of the heart We'll follow it. Just like we follow Blood flow through the heart so that begins here in the right atrium Okay, so in the right atrium we've got the fresh blood from the body coming in Typically on oxygenated you can see the fossa ovalis here. So remnant from when you were in utero Now it's just kind of an indention there in the right atrium The atrial in themselves are made up of this particular type of muscle called the pectinate muscles They help constrict the artery or the atrium The atrium so we have Left and right atrial here. They're separated By the inter atrial septum. So that's kind of the separation between the two atrium themselves Okay, so now we'll flow downward through this valve. This is our tricuspid valve here Okay, we can see the tricuspid valve has these kind of Tendrical connection points there Cordate tenon day We're a tenon day. Okay, these connect to papillary muscles here Which help open and close the valve So now we're inside of my right ventricle So just like the pectinate muscles here in the atrium the ventricles also have their own The trabiculae carnae So then blood will flow from here up my pulmonary semilunar valve the pulmonary vein pulmonary arteries coming in through my pulmonary veins into my Left atrium down through the mitral or bicuspid valve so we can still see those same similarities papillae muscles, etc Eventually out of the left ventricle coming up through my aortic semilunar valve Which is here and again out the aorta