I am studying medicine and i must say, Anatomy is so much easier and understandable with Mr. Webster! Thank you for taking time and uploading the videos! In 15 years I will tell my assistants I’ve learned the most by Mr. Webster! Thank you Sir.
My favored mnemonic for the av valves is "tri before you bi" (as in the phrase "try before you buy"). Blood goes through the tricuspid valve before it goes through the bicuspid/mitral valve.
best one I had was from my cardio lecturer in Swansea Uni, not 100% PC: Mitral is always on the left because bishops (a 'mitre' is the headdress worn by bishops) are never right.
Sam you deserve an Award/accolade just named after you. You are extremely talented in a way that you make even the simplest of all things in Anatomy even simpler! You are a gift to mankind. Thank you!
Fantastic anatomy videos! You did say that the base of the heart rests on the diaphragm which is incorrect according to my professor, anatomy text books, and the internet. The base of the heart is actually superior and medially located. The base is mostly composed of the left atrium (and some of the right atrium). I have found this concept a bit confusing but also an important one. THE HEART DOES NOT SIT ON IT'S BASE. Again thank you for the great videos i just wanted to clarify for others who may be confused.
Did I? Oops. Yes, the base of the heart is the opposite end to the apex. I guess I was thinking of the word "base" in the general way. Thanks for the clarification! You're doing what I always recommend - not relying on a single source of information (i.e. me).
I am from india. Presently Preparing for NBDE exams. Sir, You are Gr8. Its been like I have never learned Anatomy of Heart earlier in my Bachelors like you are teaching. You are fantastic mentor. Thank you so much. Respect.
Thank you very much for your great work. You inspire me everyday to study for anatomy because you make this complex subject so easy to learn only because of your type of explanation. 🙏🏼
At 1:52 is not the base of the heart The base of the heart does not sit on the diaphragm!! It is the portion of heart that is bounded superiorly by the dividing pulmonary trunk and inferiorly by the post part of the atrioventricular groove.
1:10 please do!!! I’d really love much more detail. This (relatively) short video explained flawlessly wot 10-hour lectures don’t. Thank you for your passion and really hope you do another video where you go into deeper details of the heart 😊
I’m 80 years old. Heart failure due to a virus in 1970. I currently have an ICD. My EF is in and around 15. I have never understood (to my satisfaction) what is really happening with my heart. And then I found you. Thank you so much for teaching me what I’ve failed to learn over so many years. You are blessed to have your teaching skills and I’m blessed to have you. Thank you from the bottom of my heart (no pun intended). ❤
can you make a video correlating anatomical position of organs to vertebrae? (it will make it easy to understand injuries at each level of vertebrae) thank you. your videos are a great help.
Every things makes sense and be clear with you , the naming behind mitral valve got me gasped ! 😂 , I have been trying to memorize the heart and keep forgetting it ! But YOU MAKE ANATOMY SO EASY AND CLEAAAAAR ( watching you from Africa , you have students all over the world )
Fantastic job as always! Got a bit confused though, when you talked about aortic valve incompetence you said a possible outcome would be swelling of the extremities. Shouldn’t it be pulmonary edema? 🤔 or maybe I’m just mixing things up.
If anyone is interested in parasympathetic and sympathetic innervation: Parasympathetic: Acetylcholine (ACh) released from the Vagus nerve, which terminates at the SA node, acts on muscarinic receptors (MAChr) to activate intracellular G-proteins within the SA nodal cells. These proteins inhibit the type T calcium channels whilst phosphorylating potassium channels. In essence, this results in the SA nodal cells becoming hyperpolarised and thus taking longer to reach their pacemaker potential threshold of -40mV. The overall result of this is a reduced heart rate. Sympathetic: Noradrenaline is released by post-ganglionic efferent close to the SA node where it binds to Beta 1 receptors and activates Gs protein complexes on the intracellular surface. These proteins a activate a CAmp second messenger system and protein kinases which ultimately phosphorylate the calcium and sodium channels increasing conductance for their respective ions. In essence, the -40mV threshold to the pacemaker potential is attained quicker and heart rate thus in increases. There's also a complex interaction between the nucleus tractus solaris, nucleus ambiguus, and cardiac vagal neurons that control heart rate but that's perhaps beyond the scope of this comment section. If you want to know though just ask.
How anyone could view the structure and functionality of the human body and not instantly realize that it could not have happened by accident is beyond me. God obviously designed and created all the structures. The heart etc did not come into being by a series of accidents and coincidence. People look for a miracle to prove God's existence, that miracle is staring back at you in the mirror.
I am from Bangladeshi....This channel is very Helpfully,,,,, Anatomy, it is very important subject of medical line....... THANK YOU SIR,,,,,LOVE YOU SIR
amazing! Just looking at the way the heart is engineered.... It's got something so complexly calculated to function the way it does! There is no way this could "just happen" due to random evolution over a million years! There Has to be a Designer!
I'm not in the medical field, but was interested to have general knowledge about how the heart works, and now I'm interested in the whole human body anatomy! Brilliant smooth way to share your knowledge Dr. Drake Ramoray
I had Ct scan and ecg for other reason on 22nd may and completely coincidental they discovered I’ve got a leaking mitral and tricuspid valves and it’s causing shortness of breath and pains in my chest. I get fluid retention anyway but noticed other things. The cardiac doctor said carry on as normal and yet my GP is concerned but said nothing as yet??
At this point I watch this video on an annual basis ( because I always have to revise cardiology) but I'm not complaining, I learn more each time and remember even more later on 🌟
How does the opening between the two atria close when the baby is born? Is there some way it slams shut when the baby takes its first breath? Or does it grow in slowly, and you have what amounts to a two-chamber heart for the first few months of your life?
