The Embryology of the Human Thyroid Gland Including Ultimobranchial Body and Others Related

Materials and Methods.- Description and Discussion.- I. The Prenatal Development of the Human Thyroid Gland.- A. Primordial Development: Early Differentiation Stage (3 to 13 mm CRL, 5 to 7 Weeks).- B. Preparatory Development: Preparatory Differentiation Stage (14 mm CRL to 90 mm CHL, 8 to 12 Weeks).- C. Final Development: Follicle Stage (95 to 520 mm CHL, 13 weeks to full term).- D. Topography of the Follicle Development in the Prenatal Human Thyroid Gland.- E. Bloodvessels.- F. Connective Tissue.- G. Growth of the Human Thryoid Gland in Prenatal Life.- H. Feto-Maternal Connection in the Development of the Human Thyroid Gland.- I. Human Thyroid Gland in Perinatal Life.- II. The Human Ultimobranchial Body in Prenatal Life.- A. General in the Comparative Anatomical Viewpoint.- B. Prenatal Development of the Human Ultimobranchial Body.- C. Epithelial Cells.- D. Parafollicular Cells.- E. Blood Vessels and Connective Tissue.- F. Prenatal Growth of the Human Ultimobranchial Body.- G. Chronological Relation Between the Developments of Human Thyroid Gland and Human Ultimobranchial Body.- H. Extrathyroidal Human Ultimobranchial Bodies and Those in Thyroid Aplasia and Hypoplasia.- III. Others Residuals of the 4th-5th Branchial Pouch Complex Found in the Human Thyroid Gland in Prenatal Life.- A. Thymus (IV).- B. Parathyroid (IV) Gland and its Residual Islets.- IV. Residuals of the 4th-5th Branchial (Branchial) Pouch Complex Found in the Human Newborn Thyroid Gland.- V. Residuals of the Third Branchial Pouch Origin.- Summary.- References.- Addendum.