THE COLLECTION OF RADIOACTIVE IODINE BY THE HUMAN FETAL THYROID

摘要: THE age at which the human fetal thyroid begins to function has been a matter of speculation for many years. Certain approximate time relations in regard have assigned on basis studies such as Gorbman's (1, 2) lower forms animal life. In 1836 Jones (3) was perhaps first describe microscopic structure thyroid. He found that beginning form differentiated tissue fetus 4½ months. Both Horcicka (4) and Podack (5) late nineteenth century observed typical glandular did not appear until fifth month. Cooper's (6) study various ages intrauterine growth, she follicle formation by thirteenth week, but no colloid or secretion within lumina fourth month pregnancy. The more containing seemed periphery Observations Norris (7) indicated col...