Origin and early development of the chicken adenohypophysis

Frontiers in Neuroanatomy
Luisa Sánchez-ArronesLuis Puelles

Abstract

The adenohypophysis (ADH) is an important endocrine organ involved in the regulation of many physiological processes. The late morphogenesis of this organ at neural tube stages is well known: the epithelial ADH primordium is recognized as an invagination of the stomodeal roof (Rathke's pouch), whose walls later thicken and differentiate as the primordium becomes pediculated, and then fully separated from the stomodeum. The primordium attaches to the pial surface of the basal hypothalamus, next to the neurohypophyseal field (NH; future posterior pituitary), from which it was previously separated by migrating prechordal plate (pp) cells. Once the NH evaginates, the ADH surrounds it and jointly forms with it the pituitary gland. In contrast, little is known about the precise origin of the ADH precursors at neural plate stages and how the primordium reaches the stomodeum. For that reason, we produced in the chicken a specific ADH fate map at early neural plate stages, which was amplified with gene markers. By means of experiments labeling the mapped presumptive ADH, we were able to follow the initial anlage into its transformation into Rathke's pouch. The ADH origin was corroborated to be strictly extraneural, i.e., to lie at stage...Continue Reading

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Citations

Sep 22, 2016·Molecular and Cellular Endocrinology·Leonard Y M CheungMaría Inés Pérez-Millán
May 18, 2016·BMC Developmental Biology·Shannon W DavisSally A Camper
Dec 28, 2017·Journal of Anatomy·Clemens Kiecker
Dec 17, 2020·Frontiers in Neuroanatomy·Carmen Diaz, Luis Puelles

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