## Abstract There are three fetal membranes in mammals, namely the yolk sac, allantois and amnion, but only the first two form a placenta. In Monotremata (monotremes), Marsupialia (marsupials) and Placentalia (eutherians), the yolk sac transfers nutrients originating from uterine glandular secretio
โฆ LIBER โฆ
Approximation of the yolk by the LP yolk
โ Scribed by Richard McKelvey; Craig A. Tovey
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 510 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0165-4896
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## Abstract Ultrasound scanning in early pregnancy sometimes reveals a 2โ5โmm spheric structure lying adjacent to the fetus. The occurrence of this structure was studied in 60 consecutive ultrasound examinations. In the 7th to 9th weeks the sphere was seen in 19 of 22 examinations, and in the 10th