Yolk sac — Free Biology Illustration | GPAI | GPAI

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Yolk sac — Free Biology Illustration | GPAI | GPAI

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Yolk sac

Yolk sac

Biology

Yolk sac

A small rounded to oval membranous yolk sac with a smooth bulb-like shape, attached to the embryo by a short narrow stalk or connection point. It has a thin, slightly translucent transparent wall enclosing dense yellow to golden-yellow nutrient material or a rounded yolk mass, giving it a soft swollen pouch-like appearance. The sac appears yellow to pale orange or pale gold overall, with a simple smooth surface and, at most, a subtly veined connection point.

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