WBR0139
| Author | [[PageAuthor::Rim Halaby, M.D. [1] (Reviewed by Alison Leibowitz)]] |
|---|---|
| Exam Type | ExamType::USMLE Step 1 |
| Main Category | MainCategory::Embryology |
| Sub Category | SubCategory::Cardiology |
| Prompt | [[Prompt::A 72-year-old male patient presents to the ER with an acute onset of severe anterior chest pain that is radiating to his back. ECG reveals no ischemic changes negative cardiac enzymes are within normal ranges. A chest X-ray displays a widening of the mediastinum and an MRI confirms the presence of an intimal tear consistent with an ascending aortic dissection. Which of the following most likely is the embryological origin of the ascending aorta?]] |
| Answer A | AnswerA::Truncus arteriosis |
| Answer A Explanation | [[AnswerAExp::The truncus arteriosis gives rise to the ascending aorta and the pulmonary trunk.]] |
| Answer B | AnswerB::Bulbus cordis |
| Answer B Explanation | [[AnswerBExp::The Bulbus cordis gives rise to the right ventricle and the smooth part of the left ventricle.]] |
| Answer C | AnswerC::venosum |
| Answer C Explanation | [[AnswerCExp::The Sinus venosum gives rise to the coronary sinus.]] |
| Answer D | AnswerD::Third aortic arch |
| Answer D Explanation | [[AnswerDExp::The third aortic arch gives rise to to the common carotid artery and the proximal part of the internal carotid artery.]] |
| Answer E | AnswerE::Fourth aortic arch |
| Answer E Explanation | [[AnswerEExp::The fourth aortic arch gives rise to the proximal part of the right subclavian artery.]] |
| Right Answer | RightAnswer::A |
| Explanation | [[Explanation::The truncus arteriosis gives rise to the ascending aorta and the pulmonary trunk. Educational Objective: The truncus arteriosis gives rise to the ascending aorta and the pulmonary trunk. The bulbus cordis gives rise to the right ventricle and the smooth part of the left ventricle. The sinus venosum gives rise to the coronary sinus. The third aortic arch gives rise to to the common carotid artery and the proximal part of the internal carotid artery. The fourth aortic arch gives rise to the proximal part of the right subclavian artery. |
| Approved | Approved::Yes |
| Keyword | |
| Linked Question | Linked:: |
| Order in Linked Questions | LinkedOrder:: |