COMEDK 2007 MCQ Answer 109
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The correct answer is D
The esophagus, in its course through the mediastinum, has several narrowings. The first is the upper esophageal sphincter and the next is the region of aortic crossing where the transition from striated to smooth muscle is usually found. Narrowed areas can be found where the left mainstem bronchus crosses and where the left atrium lies next to the esophagus. The last narrowing is in the zone of the lower esophageal sphincter.
The esophagus, in its course through the mediastinum, has several narrowings. The first is the upper esophageal sphincter and the next is the region of aortic crossing where the transition from striated to smooth muscle is usually found. Narrowed areas can be found where the left mainstem bronchus crosses and where the left atrium lies next to the esophagus. The last narrowing is in the zone of the lower esophageal sphincter.
Tags: Esophagus Anatomy
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