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Most of the cranial sense organs of vertebrates arise from embryonic structures known as cranial placodes. Such placodes also give rise to sensory neurons that transmit information to the brain as well as to many neurosecretory cells. This book focuses on the development of sensory and neurosecretory cell types from cranial placodes by introducing the vertebrate head with its sense organs and neurosecretory organs and providing an overview of the various cranial placodes and their derivatives, including evidence of common embryonic primordia. Schlosser discusses how these primordia are established in the early embryo and how individual placodes develop. The latter chapters explain how various placodally derived sensory and neurosecretory cell types differentiate into discrete structures.
Table des matières
Preface. The Vertebrates' New Head. The Cranial Placodes of Vertebrates - An Overview. Origin of Cranial Placodes from a Common Primordium. Development of Individual Placodes from their Common Primordium. General Mechanisms of Sensory and Neuronal Differentiation. Differentiation of Sensory and Neuronal Cell Types from Neurogenic Placodes. Differentiation of Photoreceptors. Differentiation of Cell Types from Non-Neurogenic Placodes.
References. Index
Résumé
Most of the cranial sense organs of vertebrates arise from embryonic structures known as cranial placodes. Schlosser discusses how these primordia are established in the early embryo, how individual placodes develop, and how various placodally derived sensory and neurosecretory cell types differentiate into discrete structures.
