Neurogenic placodes are specialized regions of embryonic ectoderm that generate the majority of the neurons of the cranial sensory ganglia. Indeed, cells leaving the placodes do not assume a mesenchymal morphology but migrate from the epithelium as neuronal cells.Likewise, what are Placodes?
Placodes are embryonic structures that give rise to structures such as hair follicles, feathers and teeth. The term "neurogenic placode" generally refers to cranial placodes that have neurogenic potential - i.e. those that give rise to neurons associated with the special senses and cranial ganglia.
Likewise, what is cranial ectodermal Placode? Ectodermal placodes are focal thickenings of the cranial ectoderm that generate many different components of the sensory systems of the head. The emergence and utilisation of these embryonic structures have long been viewed as being important for the evolution of the vertebrates.
Correspondingly, what are cranial Placodes?
Cranial placodes are specialized regions of the ectoderm, which give rise to various sensory ganglia and contribute to the pituitary gland and sensory organs of the vertebrate head. Integrating current data, new models of generic placode induction and of combinatorial placode specification are presented.
What is derived from neural crest?
Neural crest. Neural crest cells are a temporary group of cells unique to vertebrates that arise from the embryonic ectoderm germ layer, and in turn give rise to a diverse cell lineage—including melanocytes, craniofacial cartilage and bone, smooth muscle, peripheral and enteric neurons and glia.
Where does the neural crest originate from?
Neural crest cells originate in the ectoderm at the margins of the neural tube and, after a phase of epithelial-mesenchymal transition and extensive migration, settle down in different parts of the body to contribute to the formation of a plethora of different tissues and organs.Where are neural crest cells found?
The neural crest are bilaterally paired strips of cells arising in the ectoderm at the margins of the neural tube. These cells migrate to many different locations and differentiate into many cell types within the embryo.What are Ectomesenchymal cells?
Ectomesenchyme. The origin of the ectomesenchyme is disputed. It is either like the mesenchyme, arising from mesodermic cells, or conversely arising from neural crest cells. The neural crest is a critical group of cells that form in the cranial region during early vertebrate development.What is neural plate?
The neural plate is a key developmental structure that serves as the basis for the nervous system. Opposite the primitive streak in the embryo, ectodermal tissue thickens and flattens to become the neural plate. The region anterior to the primitive knot can be generally referred to as the neural plate. 
