WBR0139

Author	[[PageAuthor::Rim Halaby, M.D. [1]]]
Exam Type	ExamType::USMLE Step 1
Main Category	MainCategory::Embryology
Sub Category	SubCategory::Cardiology
Prompt	[[Prompt::A 72-year-old male patient presented to the emergency department for acute onset of severe anterior chest pain that is radiating to his back. Initial investigations reveal no changes on ECG and negative cardiac enzymes. A chest X-ray shows widening of the mediastinum and MRI confirms the presence of intimal tear consistent with an ascending aortic dissection. What is the embryological origin of the ascending aorta?]]
Answer A	AnswerA::Truncus arteriosis
Answer A Explanation	AnswerAExp::Truncus arteriosis gives rise to the ascending aorta and the pulmonary trunk.
Answer B	AnswerB::Bulbus cordis
Answer B Explanation	AnswerBExp::Bulbus cordis gives rise to the right ventricle and the smooth part of the left ventricle.
Answer C	AnswerC::Sinus venosum
Answer C Explanation	AnswerCExp::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 aortic arch and 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. 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 aortic arch and the proximal part of the right subclavian artery. Educational Objective: References: ]]
Approved	Approved::No
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