LP7737-2
Yolk sac
Active
Descriptions
The yolk sac is the first element seen in the gestational sac during pregnancy, usually at 5 weeks gestation. It is a critical landmark, identifying a true gestation sac. It is quite echogenic (light) to ultrasound, and reliably seen early. In the mouse, the yolk sac is the first site of blood formation, generating primitive macrophages and erythrocytes. Details from Gray's anatomy:The yolk-sac is situated on the ventral aspect of the embryo ; it is lined by endoderm, outside of which is a layer of mesoderm. It is filled with fluid, the vitelline fluid, which possibly may be utilized for the nourishment of the embryo during the earlier stages of its existence. Blood is conveyed to the wall of the sac by the primitive aort¦, and after circulating through a wide-meshed capillary plexus, is returned by the vitelline veins to the tubular heart of the embryo. Copyright Text is available under the Creative Commons Attribution/Share-Alike License. See http://creativecommons.org/licenses/by-sa/3.0/ for details. Source: Wikipedia, Yolk sac (Wikipedia)
The first of four extra-embryonic membranes to form during embryogenesis. In reptiles and birds, it arises from endoderm and mesoderm to incorporate the egg yolk into the digestive tract for nourishing the embryo. In placental mammals, its nutritional function is vestigial; however, it is the source of intestinal mucosa, blood cells, and germ cells. It is sometimes called the vitelline sac, which should not be confused with the vitelline membrane of the egg. Source: National Library of Medicine, MeSH 2006
Basic Part Properties
- Part Name
- Yolk sac
- Part Display Name
- Yolk sac
- Part Type
- System (Describes the name of the system (sample) type)
- Created On
- 2000-05-03
- Construct for LOINC Short Name
- Yolk sac
LOINC Terminology Service (API) using HL7® FHIR® Get Info
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Language Variants Get Info
| Tag | Language | Translation |
|---|---|---|
| ru-RU | Russian (Russian Federation) | Желточный мешок |
| zh-CN | Chinese (China) | 卵黄囊 |
| it-IT | Italian (Italy) | Sacco vitellino |
| el-GR | Greek (Greece) | Λεκιθικός σάκος Synonyms: Λεκιθικός σάκος |
LOINC Copyright
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