| Library / English Dictionary |
YOLK SAC
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
Membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
Classified under:
Hypernyms ("yolk sac" is a kind of...):
sac (a structure resembling a bag in an animal)
Sense 2
Meaning:
Membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
Synonyms:
umbilical vesicle; vesicula umbilicus; vitelline sac; yolk sac
Classified under:
Nouns denoting animals
Hypernyms ("yolk sac" is a kind of...):
sac (a structure resembling a bag in an animal)
Context examples:
A yolk sac tumor that arises from the ovary and occurs in children.
(Childhood Ovarian Yolk Sac Tumor, NCI Thesaurus)
A yolk sac tumor that arises from the ovary and is characterized by the presence of extensive differentiation into hepatic tissue.
(Ovarian Yolk Sac Tumor, Hepatoid Pattern, NCI Thesaurus)
It includes the dysgerminoma, yolk sac tumor, choriocarcinoma, embryonal carcinoma and immature teratoma.
(Childhood Malignant Ovarian Germ Cell Tumor, NCI Thesaurus)
It includes the embryonal carcinoma, yolk sac tumor, choriocarcinoma, and mixed germ cell tumors.
(Childhood Malignant Testicular Germ Cell Tumor, NCI Thesaurus)
There are several types of nonseminoma tumors, including embryonal carcinoma, malignant teratoma, choriocarcinoma, and yolk sac tumor.
(Nonseminoma, NCI Dictionary)
Representative examples include teratoma, seminoma, embryonal carcinoma, and yolk sac tumor.
(Germ cell tumor, NCI Thesaurus)
Nonseminomas are identified by the type of cell in which they begin and include embryonal carcinoma, teratoma, choriocarcinoma, and yolk sac carcinoma.
(Non-Seminomatous Lesion, NCI Dictionary)
The different germ cell components include choriocarcinoma, embryonal carcinoma, yolk sac tumor, teratoma, and seminoma.
(Mixed Germ Cell Tumor, NCI Thesaurus)
Alpha-fetoprotein is a major plasma protein produced by the yolk sac and the liver during fetal life.
(Alpha-fetoprotein, NCI Thesaurus/LocusLink)
The other two types of stem cell in the blastocyst are the extra-embryonic trophoblast stem cells (TSCs), which will form the placenta, and primitive endoderm stem cells (PESCs) that will form the yolk sac, ensuring that the foetus’s organs develop properly and providing essential nutrients.
(Scientists generate key life event in artificial mouse ‘embryo’ created from stem cells, University of Cambridge)
