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[Hypothalamo-hypophyseal relationships in the chick embryo].
Comptes Rendus Des Seances De La Societe De Biologie Et De Ses Filiales
|January 1, 1975
Summary
Grafted hypophysis cannot induce normal thyroid development in decapitated chick embryos. This suggests hypothalamo-pituitary correlations emerge late in incubation, impacting thyroid growth and iodine uptake.
Area of Science:
- Developmental biology
- Endocrinology
- Embryology
Context:
- Chick embryo development is crucial for understanding vertebrate embryogenesis.
- The hypothalamo-pituitary axis regulates numerous developmental processes.
- Previous research debated the existence of hypothalamo-pituitary correlations in chick embryos.
Purpose:
- To investigate the role of the hypothalamo-pituitary complex in chick thyroid development.
- To determine if the pituitary gland can regulate thyroid growth without hypothalamic input.
- To explore the timing of hypothalamo-pituitary axis maturation during chick embryogenesis.
Summary:
- Partial decapitation of chick embryos removed the hypothalamo-pituitary complex.
- A hypophysis (pituitary gland) was grafted onto these embryos.
- The grafted hypophysis failed to induce normal thyroid development, resulting in reduced thyroid volume and decreased iodine fixation from day 16.
Impact:
- These findings challenge the notion that hypothalamo-pituitary correlations are absent in chick embryos.
- The results indicate that hypothalamo-pituitary correlations appear towards the end of the incubation period.
- This study provides insights into the establishment of endocrine regulation during embryonic development.