yolk sac

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Related to yolk sac: Gestational sac
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  • noun

Synonyms for yolk sac

membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional

membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes

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References in periodicals archive ?
Successful orthotopic liver transplantation for treatment ofa hepatic yolk sac tumor.
Newly hatched yolk sac larvae were kept in the incubation tank with continuous flow of water for about two days or till the yolk of the yolk sac larvae was absorbed.
Volume of the yolk sac was estimated according to the formula below which assumes an oval-shaped yolk sac (Blaxter & Hempel 1966; Cetta & Capuzzo 1982);
Studying fish and reptiles, he traced their journey through the yolk sac, embryo, and back, where he found that the cell population grew from 100 at the beginning to about 4000 by the time they reached the genital ridge.
It is a vestigial remnant of the original yolk sac or vitello-intestinal duct (1) and was originally described by Johann F Meckel in 1809.
Ten to 20 days after hatching, the internal yolk sac became exhausted, whereupon hatchlings were fed ad libitum on wild-caught zooplankton at a density of -90 organisms/L or with enriched adult Artemia (density, 50 organisms/L).
In all cases, ultrasound identified a gestational sac and yolk sac consistent with the gestational age as measured by the last menstrual period," Dr.
The relative weight of yolk sac was expressed as a percentage of body weight, while the relative weight of heart or liver was expressed on the basis of the yolk sac-free chick weight.
The yolk sac was present, measuring 5 cm in diameter, and its grayish-yellow content was sampled for aerobic culture.
The sublethal effects were indicative of stress and may have been causative factors in reduced larval survival; they included precocious hatch, smaller larval size with larger yolk sac at hatch, and reduced growth rate.
The hypoblast grows outward to form a layer of tissue (primitive endoderm) that lines the blastocoele and eventually gives rise to the yolk sac.
Twenty five micro-liters (10 mg/mL concentration) of the yolk sac extract (pre or post) were mixed with 25 [micro]L of loading buffer (152 [micro]L laemmli sample buffer and 8 [micro]L 2-ME).