Which of these statements about oesophagus is true?
a. Is 40 cm in length
b. Is lined by stratified squamous epithelium in the upper two-thirds
c. Is lined by transitional epithelium in the lower one third
d. Drains all of its blood into the azygos and hemiazygos veins
The Correct option is B
Explanation with High Yield Facts:
The oesophagus is 25 cm in length. The oesophagogastric junction lies 40 cm from the incisors. The oesophagus is lined by both striated (upper two-thirds) and smooth (lower third) muscle. The lower third is line by columnar epithelium. The venous drainage is into the inferior thyroid, azygos and left gastric veins. The communication between the azygos and left gastric veins is an important portosystemic anastomosis that can be the site of oesophageal varices.
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