Which membrane closes the gut tube at the caudal end?

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Prepare for the Alimentary and Digestive System Test. Utilize flashcards and multiple-choice questions, with hints and explanations for each question. Ace your exam with confidence!

Multiple Choice

Which membrane closes the gut tube at the caudal end?

Explanation:
The caudal end of the gut tube is closed by the cloacal membrane. This membrane forms where endoderm of the hindgut meets surface ectoderm, with no intervening mesoderm. It keeps the gut closed until it ruptures later in development to create the anal opening. The cranial end, in contrast, is closed by the oropharyngeal (buccopharyngeal) membrane. The term cloacal membrane specifically denotes the caudal closure, which is why it’s the correct choice.

The caudal end of the gut tube is closed by the cloacal membrane. This membrane forms where endoderm of the hindgut meets surface ectoderm, with no intervening mesoderm. It keeps the gut closed until it ruptures later in development to create the anal opening. The cranial end, in contrast, is closed by the oropharyngeal (buccopharyngeal) membrane. The term cloacal membrane specifically denotes the caudal closure, which is why it’s the correct choice.

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