| yolk s. |
the extraembryonic membrane that connects with the midgut; at the end of the fourth week of development it expands into the pear-shaped umbilical vesicle connected to the body of the embryo by the long narrow yolk stalk. In marsupial and placental mammals, it produces a complete vitelline circulation in the early embryo and then undergoes regression; in oviparous vertebrates, it encloses the yolk mass, breaks down yolk, and makes it available to the developing organism. In human embryos it does not serve a primary nutritive function, but it is the first hematopoietic organ of the embryo. Called also vitelline s.
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| yolk sac c. |
see under tumor.
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| yolk sac t. |
a malignant germ cell tumor of children that represents a proliferation of both yolk sac endoderm and extraembryonic mesenchyme. It is characterized by a labyrinthine glandular pattern with a papillary projection into a sinuslike space; frequently there are hyaline bodies and Schiller-Duval bodies. It produces α-fetoprotein and most often occurs in the testes, but is also seen in the ovaries and some extragonadal sites. Called also infantile embryonal carcinoma, juvenile embryonal carcinoma, yolk sac carcinoma, orchioblastoma, and endodermal sinus t.
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| yolk-sac e. |
the epithelial lining of the yolk sac.
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| yolk-sac p. |
choriovitelline p.
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