Podcast
Questions and Answers
Which of the following statements about the left anterior descending artery (LAD) is correct?
Which of the following statements about the left anterior descending artery (LAD) is correct?
- It originates from the right coronary artery in cases of left dominance.
- It runs in the anterior interventricular groove and supplies the anterior papillary muscle. (correct)
- It supplies the posterior one-third of the interventricular septum.
- It terminates by anastomosing with the circumflex artery.
In right coronary dominance, which artery supplies the posterior one-third of the interventricular septum?
In right coronary dominance, which artery supplies the posterior one-third of the interventricular septum?
- Circumflex artery
- Left anterior descending artery (LAD)
- Marginal artery
- Posterior interventricular artery (correct)
Which of the following statements about left coronary dominance is correct?
Which of the following statements about left coronary dominance is correct?
- It is the most common pattern, occurring in approximately 70% of individuals.
- The posterior interventricular artery originates from the right coronary artery.
- The left coronary artery supplies only the left atrium and left ventricle.
- The circumflex artery gives rise to the posterior interventricular artery. (correct)
Which of the following is NOT a tributary of the coronary sinus?
Which of the following is NOT a tributary of the coronary sinus?
Which of the following statements about the distribution of the left coronary artery is correct?
Which of the following statements about the distribution of the left coronary artery is correct?
Which of the following arteries anastomoses with the termination of the posterior interventricular artery?
Which of the following arteries anastomoses with the termination of the posterior interventricular artery?
Which of the following structures does the left coronary artery not supply?
Which of the following structures does the left coronary artery not supply?
In a right dominant coronary circulation, which artery supplies the posterior descending artery?
In a right dominant coronary circulation, which artery supplies the posterior descending artery?
Which of the following veins does not drain directly into the coronary sinus?
Which of the following veins does not drain directly into the coronary sinus?
In a left dominant coronary circulation, which artery supplies the posterior descending artery?
In a left dominant coronary circulation, which artery supplies the posterior descending artery?
Which of the following is not a branch of the right coronary artery?
Which of the following is not a branch of the right coronary artery?
Which of the following statements about the coronary sinus is incorrect?
Which of the following statements about the coronary sinus is incorrect?
Which of the following statements regarding the left coronary artery is correct?
Which of the following statements regarding the left coronary artery is correct?
In which percentage of the population does the artery of the sinoatrial (S.A.) node arise from the right coronary artery?
In which percentage of the population does the artery of the sinoatrial (S.A.) node arise from the right coronary artery?
Which of the following is NOT a branch of the right coronary artery?
Which of the following is NOT a branch of the right coronary artery?
Which of the following structures is NOT drained by the coronary sinus tributaries?
Which of the following structures is NOT drained by the coronary sinus tributaries?
In what percentage of the population does the branch to the atrioventricular (A.V.) node arise from the right coronary artery?
In what percentage of the population does the branch to the atrioventricular (A.V.) node arise from the right coronary artery?
Which of the following statements regarding coronary artery dominance is correct?
Which of the following statements regarding coronary artery dominance is correct?
Flashcards
Left Coronary Artery
Left Coronary Artery
Artery that branches into the circumflex artery and the left anterior descending artery (LAD).
Circumflex Branch
Circumflex Branch
Branch of the left coronary artery that runs in the posterior atrio-ventricular groove, giving off marginal branches and anastomosing with the right coronary artery.
Left Anterior Descending Artery (LAD)
Left Anterior Descending Artery (LAD)
Branch of the left coronary artery that runs in the anterior interventricular groove, supplying the anterior septal, anterior lateral, and apical portions of the left ventricle.
Distribution of Left Coronary Artery
Distribution of Left Coronary Artery
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Right Dominance (Coronary)
Right Dominance (Coronary)
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Left Dominance (Coronary)
Left Dominance (Coronary)
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Right Coronary Artery Supply
Right Coronary Artery Supply
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Left Coronary Artery Supply
Left Coronary Artery Supply
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Origin of Right Coronary Artery
Origin of Right Coronary Artery
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Course of Right Coronary Artery
Course of Right Coronary Artery
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Branches of Right Coronary Artery
Branches of Right Coronary Artery
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Right Posterior Descending Artery Supply
Right Posterior Descending Artery Supply
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Sick Sinus Syndrome
Sick Sinus Syndrome
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Heart Block
Heart Block
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Myocardial Infarction
Myocardial Infarction
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Study Notes
Coronary Arteries
- The left coronary artery is approximately 2 cm long and divides into two branches: the circumflex branch and the left anterior descending artery (LAD) or anterior interventricular artery.
Circumflex Branch
- The circumflex branch runs in the posterior atrio-ventricular groove.
- It gives off marginal branches and obtuse marginal branches.
- It ends by anastomosing with the right coronary artery.
Left Anterior Descending Artery (LAD)
- The LAD runs in the anterior interventricular groove to the apex, then the posterior interventricular groove.
- It ends by anastomosing with the termination of the posterior interventricular artery.
- During its course, it supplies the anterior septal, anterior lateral, and apical portions of the left ventricle and the anterior papillary muscle.
Distribution Pattern of Left Coronary Artery
- The left coronary artery supplies most of the left atrium and left ventricle, and most of the interventricular septum, including the atrioventricular bundle and its branches.
Variations of Coronary Arteries
- Right dominance: The posterior interventricular artery originates from the right coronary artery (70%).
- Left dominance: The posterior interventricular artery originates from the circumflex artery (20%).
Coronary Arteries and Heart Chambers
- The right coronary artery supplies the right atrium, right ventricle, and inferior aspect of the left ventricle.
- The left coronary artery supplies the left atrium, left ventricle, and most of the interventricular septum.
Right Coronary Artery
- Origin: The right coronary artery originates from the anterior superior aortic sinus of the ascending aorta.
- Course: It passes to the right between the right auricle and the pulmonary trunk, then descends vertically in the coronary sulcus.
- Branches:
- Artery of SA node (60% of population)
- Branch to AV node (90% of population)
- Marginal branches: supply both surfaces of the right ventricle
- Right posterior descending (Posterior interventricular artery): supplies inferior aspect of RV, LV, interventricular septum, and posterior papillary muscle
Clinical Correlation
- Damage to vessels supplying portions of the conducting system leads to specific defects (myocardial infarction).
- Sick sinus syndrome (tachy-brady syndrome): due to damage to the sinus nodal artery.
- Damage to the artery supplying the AV node or bundle of His leads to complete heart block.
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