anatomy 17 - 22.6 anterior internal view Dark spot in the...

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- 22.6 anterior internal view o Dark spot in the wall of the right atrium = opening from the coronary sinus o Fossa ovalis Larger dark spot in the wall of the right atrium When you were a fetus a large portion of the blood that came into the right atrium went directly into the left atrium (only a minor portion went into the right ventricle to go into the lungs because you only needed to grow the lungs, not use them). When you were born a little flap formed over the opening, and it eventually completely closes. If it doesn’t close on its own it must be sutured closed. o atrioventricular valves Connects right Dense connective tissue Held open and also held in the closed position by chordate tendineae Dense regular connective tissue Attached to capillary muscles on the wall of the lumen The right one is sometimes tricuspin valve Made up of three flaps of tissues Left one is called bicuspin valve Made up of two flaps o Notice the thickness differences in left and right Just enough thickness to do what it has to do In the right ventricle it just has to squeeze blood into the lungs, so its pretty
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anatomy 17 - 22.6 anterior internal view Dark spot in the...

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