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The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
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Low blood levels of the thyroid hormones — triiodothyronine (T3) and thyroxine (T4) — signal the hypothalamus to release the thyrotropin-releasing hormone (TRH). TRH then reaches the pituitary gland and stimulates the release of thyroid-stimulating hormone(TSH) into the bloodstream.
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The thyroid gland is a small, butterfly-shaped gland located in the neck and covers the anterior surface of the trachea. The gland has two lateral lobes connected by a thin tissue mass called the isthmus. Internally, each lobe comprises many small spherical structures known as thyroid follicles, surrounded by a network of blood vessels.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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An Ex vivo Culture System to Study Thyroid Development
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Thyroid Function During the Fetal and Neonatal Periods.

Liane Eng1, Leslie Lam1

  • 1Division of Pediatric Endocrinology and Diabetes, The Children's Hospital at Montefiore, Albert Einstein College of Medicine, Bronx, NY.

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Summary
This summary is machine-generated.

Thyroid hormones are crucial for infant growth and brain development. Understanding fetal and neonatal thyroid function is key to diagnosing thyroid disorders in newborns.

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Area of Science:

  • Endocrinology
  • Neonatal Physiology
  • Developmental Biology

Background:

  • Thyroid hormones are vital for infant growth and neurodevelopment.
  • The fetal hypothalamic-pituitary-thyroid axis matures in utero, with initial dependence on maternal hormones.
  • Neonatal thyroid function undergoes rapid changes post-birth.

Purpose of the Study:

  • To review the embryology and physiology of the fetal and neonatal thyroid axis.
  • To highlight factors affecting thyroid hormone levels in newborns.
  • To inform the evaluation of thyroid disorders in neonates.

Main Methods:

  • Review of existing literature on fetal and neonatal thyroid development and function.
  • Analysis of physiological changes in thyroid hormone levels from gestation to infancy.
  • Discussion of clinical implications for thyroid disorder diagnosis.

Main Results:

  • Fetal thyroid axis development involves a transition from maternal to autocrine hormone production.
  • Postnatal adaptation includes a surge in thyroid-stimulating hormone and subsequent thyroid hormone increase.
  • Prematurity, critical illness, and maternal Graves' disease can impact neonatal thyroid status.

Conclusions:

  • Understanding normal thyroid development is essential for identifying neonatal thyroid dysfunction.
  • Factors like prematurity and maternal conditions pose risks for neonatal thyroid imbalances.
  • Early recognition and management of neonatal thyroid disorders are critical for optimal outcomes.