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Yolk stalk

A narrow tube present in the early embryo that connects the midgut of the embryo (through the umbilical opening) to the yolk sac outside the embryo. Later in development, the yolk stalk is usually obliterated but a remnants of it may persist, most commonly as a finger-like protrusion from the small intestine known as meckel's diverticulum. Meckel's diverticulum may become inflamed much like the appendix and require surgical removal. Also known as the umbilical duct.
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