Which layer forms the innermost membranous sac around the developing fetus?

Study for the DAT High Yield Biology Test. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

The amnion is the innermost membranous sac that envelops the developing fetus. It plays a crucial role in providing a protective environment by maintaining a fluid-filled cavity known as the amniotic cavity. This fluid surrounds the fetus, cushioning it from physical shocks, helping to regulate temperature, and allowing for movement and development.

In addition to its protective functions, the amniotic fluid also facilitates the development of the lungs and gastrointestinal tract, as the fetus inhales and swallows the fluid, aiding in their growth and maturation. The amnion, therefore, is vital for the healthy development of the fetus during pregnancy, distinguishing it from other structures such as the chorion, allantois, and yolk sac, which have different roles in embryonic development and do not directly form the innermost protective layer.

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