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Neurogenesis - Anatomy & Physiology (view source)
Revision as of 17:21, 26 August 2008
, 17:21, 26 August 2008→Neural Crest
::'''Trunk Neural Crest''' forms; sensory neurones of the somatic and autonomic nervous systems (ANS); sympathetic motor neurones of the ANS; melanocytes.
::'''Trunk Neural Crest''' forms; sensory neurones of the somatic and autonomic nervous systems (ANS); sympathetic motor neurones of the ANS; melanocytes.
::'''Posterior Neural Crest''' forms parasympathetic motor neurones of the gut, which control peristalsis.
::'''Posterior Neural Crest''' forms parasympathetic motor neurones of the gut, which control peristalsis.
==Ectodermal Placodes==
*The ectoderm thickens in places, with cells changing from cuboidal to columnar. These regions are called '''placodes'''.
*Placodes may be neurogenic or non - neurogenic. Neurogenic placodes are only found in the head, forming only sensory cells.
*Morphogenic changes produce the following derivatives:
::'''Nasal placodes''' - by partial invagination.
::'''Inner Ear''' - by invagination and vesicle formation.
::'''Sensory Ganglion of Canial Nerves''' - epithelial to mesenchymal transition.