[Thyroid function and iodine metabolism in the chicken embryo].
Iodine is accumulated in the egg yolk during oogenesis. It is transferred during incubation through the walls of the yolk sac (extraembryonic endomesoderm surrounding the yolk) to the extraembryonic, and thence to the embryonic circulation. Iodine exchanges would probably occur between both compartments, the egg yolk and the embryonic blood in which the iodine level increases from day 10 to 20 of incubation. The increase of thyroid gland iodine content parallels that of the plasma iodine level. Our results suggested that the pituitary gland, which acts directly on the developing thyroid gland, might also influence the iodine exchanges across the yolk sac wall, thereby affecting the thyroid by increasing the iodine supply.
D000818:Animals; D002642:Chick Embryo / Q000502:physiology*; D004530:Egg Yolk; D005260:Female; D007455:Iodine / Q000097:blood / Q000378:metabolism*; D013961:Thyroid Gland / Q000502:physiology*; D013997:Time Factors; D015017:Yolk Sac / Q000378:metabolism
D007455:Iodine
Fonction thyroïdienne et métabolisme de l'iode chez l'embryon de Poulet.