Coronary circulation is the circulation of blood in the blood vessels that supply the heart muscle (myocardium). Coronary arteries supply oxygenated blood to the heart muscle, and cardiac veins drain away the blood once it has been deoxygenated.
Where does blood go after the coronary arteries?
The aorta (the main blood supplier to the body) branches off into two main coronary blood vessels (also called arteries). These coronary arteries branch off into smaller arteries, which supply oxygen-rich blood to the entire heart muscle.
What is the destination of coronary venous blood?
Most cardiac veins collect and return blood to the right atrium through the coronary sinus; there may or not be a Thebesian valve covering the ostium of the coronary sinus.
What do the coronary veins take blood away from?
The coronary arteries are responsible for carrying nutrient-rich, oxygenated blood from the left ventricle to the myocardium; while the coronary veins take nutrient – poor deoxygenated blood away from the myocardium and to the right atrium.
Where do coronary veins drain to?
This vein typically empties into the coronary sinus, but sometimes drains into the middle cardiac vein or directly into the right atrium.
What happens if coronary artery is blocked?
When one or more of the coronary arteries suddenly becomes completely blocked, a heart attack (injury to the heart muscle) may occur. If the blockage occurs more slowly, the heart muscle may develop small collateral blood vessels (or detours) for other coronary arteries to reroute the blood flow, and angina occurs.
Which coronary artery is most commonly blocked?
Importance in cardiovascular diseases:
The LAD artery is the most commonly occluded of the coronary arteries. It provides the major blood supply to the interventricular septum, and thus bundle branches of the conducting system.
How many veins are in the heart?
Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium. As the atrium contracts, blood flows from your right atrium into your right ventricle through the open tricuspid valve.
What Veins collect blood from the heart muscle?
Coronary veins (in blue) – take oxygen-poor (“deoxygenated”) blood that has already been “used” by muscles of the heart and returns it to the right atrium.
Where do most cardiac veins drain?
- cardiac veins which drain into the coronary sinus: great cardiac vein. middle cardiac vein. …
- the anterior cardiac veins which drain directly into the right atrium.
- the venae cordis minimae (smallest cardiac veins a.k.a. Thebesian veins) which drain directly into all four chambers, but are most frequent in the right atrium.
What are the 3 types of veins?
What are the different types of veins?
- Deep veins are located within muscle tissue. …
- Superficial veins are closer to the skin’s surface. …
- Pulmonary veins transport blood that’s been filled with oxygen by the lungs to the heart.
What are the 5 major coronary arteries?
- Left coronary artery (LCA) Left anterior descending artery. Left circumflex artery. Posterior descending artery. Ramus or intermediate artery.
- Right coronary artery (RCA) Right marginal artery. Posterior descending artery.
What is the main function of the coronary veins?
The primary physiological function of the coronary veins is to carry deoxygenated blood from the myocardium and empty them into the chambers of the heart.
Do all veins drain into coronary sinus?
The coronary sinus receives drainage from most epicardial ventricular veins, including the oblique vein of the left atrium (and other left and right atrial veins), the great cardiac vein, the posterior vein of the left ventricle, the left marginal vein, and the posterior interventricular vein.
Do all cardiac veins drain into the coronary sinus?
The coronary sinus is a collection of veins joined together to form a large vessel that collects blood from the heart muscle (myocardium). It delivers less-oxygenated blood to the right atrium, as do the superior and inferior venae cavae.
What veins drain the heart?
Venous Supply to the Heart. The great cardiac vein, the middle cardiac vein, and the small cardiac vein all drain into the coronary sinus (which opens into the right atrium). The anterior cardiac veins drain directly into the right atrium.