How to Use yolk sac in a Sentence

yolk sac

noun

• And although the yolk sac appeared unusually large – a potential warning sign – the heartbeat marked a major milestone.
  — Tereza Shkurtaj, PEOPLE, 1 Feb. 2026
• His photos show the tiny salamanders still attached to yolk sacs, a stage that had never been recorded in the wild before, per National Park Service.
  — Samantha Agate, Charlotte Observer, 8 Apr. 2026
• The two tiny hatchlings, each weighing only 3 grams, were taken into surgery and received an operation that entailed the vascular tissue being cut and the yolk sacs being sewn closed.
  — Raven Brunner, PEOPLE, 26 Sep. 2025
• What’s more, the individual had an abdominal yolk, a portion of the egg’s yolk sac that an embryo internalizes into its body cavity just before hatching to use as an energy reserve.
  — Jacek Krywko, ArsTechnica, 23 June 2026
• This allowed the researchers to analyze information about the fetus, including the distance between the embryo’s head and its buttocks (which suggests size and development) and the volume of the yolk sac.
  — Tom Gavin, EverydayHealth.com, 24 Mar. 2026