Placodes - Embryology
WEBThe term placode refers to ectoderm thickenings in the cranial region that have important roles in development of special sensory and other systems. There are also integumentary placodes that are involved with hair follicle development covered on a …
Ectodermal Placode - an overview | ScienceDirect Topics
WEBEctodermal placodes are the embryonic source of a large proportion of the cranial sensory PNS [7–9]. Morphologically placodes are first visible as transient ectodermal thickenings at stereotypical locations in the vertebrate head (see Figures 8.2 and 8.3) [1].
Making a head: Neural crest and ectodermal placodes in cranial …
WEBMar 3, 2023 · The vertebrate head receives contributions from a diverse array of developmental cell populations, including the neural crest and the cranial placodes. The peripheral nervous system is derived from interactions between the cranial neural crest cells and the cranial ectodermal placodes.
The Molecular Basis of Craniofacial Placode Development
WEBThe sensory organs of the vertebrate head originate from simple ectodermal structures known as cranial placodes. All cranial placodes derive from a common domain adjacent to the neural plate, the pre-placodal region, which is induced at the border of neural and non-neural ectoderm during gastrulation.
Human stem cell models to study placode development, function …
WEBAug 30, 2022 · Placodes are embryonic structures originating from the rostral ectoderm that give rise to highly diverse organs and tissues, comprising the anterior pituitary gland, paired sense organs and cranial sensory ganglia.
Riding the crest to get a head: neural crest evolution in ... - Nature
WEBSep 1, 2021 · Formation of cranial placodes (part c) is also a defining feature of the vertebrate new head, and these ectodermal thickenings give rise to sensory neurons. For example, the three epibranchial...
The origin and evolution of the ectodermal placodes - PMC
WEBApr 18, 2012 · 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.
Neurogenic placodes: a common front: Trends in Neurosciences …
WEBJul 1, 2000 · Neurogenic placodes are specialized regions of the embryonic ectoderm that are central to the development of the cranial sensory systems of vertebrates. These structures generate many of the sensory neurones of the head and also, in some instances, the associated sensory receptor cells.
The pre-vertebrate origins of neurogenic placodes | Nature
WEBAug 10, 2015 · The sudden appearance of the neural crest and neurogenic placodes in early branching vertebrates has puzzled biologists for over a century 1. These embryonic tissues contribute to the development...
Early development of the cranial sensory nervous system: from …
WEBDec 1, 2004 · Placodal cells give rise to the majority of neurons that form the cranial sensory nervous system contributing to the cranial ganglia and the special sense organs associated with hearing, balance, olfaction and vision.