QuestionSBA
QuestionChoice
This is not the correct answer. This describes the epithelial lining of the lower 1/3rd of the oesophagus. This is also why adenocarcinomas are often found in the lower third of the oesophagus, as opposed to squamous cell carcinoma in the upper 2/3rd as the latter is lined by non-keratinized stratified squamous epithelium.
10027392
b
Simple columnar
QuestionChoice
This is not the correct answer. The oesophagus does not have keratinized epithelium as it is not exposed to dryness, friction or abrasion.
10027394
d
Keratinized stratified squamous epithelium
QuestionChoice
This is not the correct answer. Simple cuboidal epithelium is commonly found in glandular secreting tissue and kidney tubules. The upper 2/3rd of the oesophagus is lined by non-keratinized stratified squamous epithelium.
10027395
e
Simple cuboidal epithelium
QuestionChoice
This is not the correct answer. This describes the "Z line" at the gastroesophageal (squamocolumnar) junction, which demarcates the transition from non-keratinized stratified squamous epithelium to simple columnar epithelium of the gastric cardia. This is also the landmark for Barrett's oesophagus in oesophagogastroduodenoscopy and on biopsy where the Z line will appear irregular due to intestinal metaplasia. The upper 2/3rd of the oesophagus is lined by non-keratinized stratified squamous epithelium.
10027393
c
Combination of non-keratinized stratified squamous and simple columnar
QuestionChoice
This is the correct answer. This describes the epithelial lining of the upper 2/3rd of the oesophagus, while the lower 1/3rd is lined by simple columnar epithelium. This is also why adenocarcinomas are often found in the lower third of the oesophagus, as opposed to squamous cell carcinoma in the upper 2/3rd.
10027391
a
Non-keratinized stratified squamous epithelium
Concept
Chapter
2693
3985
Oesophageal carcinoma
Topic
136
Gastroenterology
17876
What type of epithelium lines upper 2/3rd the oesophagus?
a