Pituitary hormones
Feedback hypothalamus and pituitary
vascular connection
Thyroid gland
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Histogenesis in embryo
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Colloid in follicles
early fetus
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Thyroid hormone
second trimester
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Pituitary TSH
(Thyroid stimulating hormone)
Hypothalamus TRH
(Thyrotropic releasing hormone)
later second trimester
Anterior pituitary
Hypothalamus
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