MCQ Anatomy Answer 56
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The correct answer is F.
Explanation:
This patient has coarctation of the aorta (constriction of the ascending aorta), which is suggested by a midsystolic murmur over the anterior part of the chest and back, hypertension in the upper extremities, and absent or delayed pulsations in the femoral arteries. The upper extremities and thorax may be more developed than the lower extremities. Patients with coarctation of the aorta may experience symptoms such as cold extremities as a result of tissue ischemia.The truncus arteriosus gives rise to the proximal portions of the ascending aorta and the pulmonary trunk. The third, 4th, and 6th aortic arches and the right and left dorsal aortae contribute to the remainder of the aorta.
The bulbus cordis (choice A) gives rise to the right ventricle and the aortic outflow tract.
98% of cases of coarctation of the aorta take place immediately distal to the offshoot of the left subclavian artery, close to the junction of the ductus arteriosus (choice B) with the aorta.
The left horn of the sinus venosus (choice C) gives rise to the coronary sinus.
The right common cardinal vein (choice D) gives rise to the superior vena cava.
The right horn of the sinus venosus (choice E) gives rise to the smooth part of the right atrium.
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