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Neurogenesis - Anatomy & Physiology (view source)
Revision as of 19:04, 28 June 2012
, 19:04, 28 June 2012no edit summary
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== Introduction ==
== Introduction ==
#'''Glia''' - for insulation of electrical signals.
#'''Glia''' - for insulation of electrical signals.
Glia form oligodendrocytes in the CNS, and [[PNS Structure - Anatomy & Physiology#The_Schwann_Cell|schwann cells]] in the PNS. Glial cells surround the axons furthest away form the lumen of the neural tube. Because this part is myelinated, it appears ''white'' and is called the '''marginal layer'''. Axons closer to the lumen of the neural tube, which the glial cells do not surround appear ''grey''. This layer is called the '''intermediate layer'''. The ventricular layer persists, so that the spinal cord develops with these three layers.
Glia form oligodendrocytes in the CNS, and [[PNS Structure - Anatomy & Physiology#Schwann Cell|schwann cells]] in the PNS. Glial cells surround the axons furthest away form the lumen of the neural tube. Because this part is myelinated, it appears ''white'' and is called the '''marginal layer'''. Axons closer to the lumen of the neural tube, which the glial cells do not surround appear ''grey''. This layer is called the '''intermediate layer'''. The ventricular layer persists, so that the spinal cord develops with these three layers.
In the brain, further layers are added to increase complexity. This is possible because in the anterior of the embryo, neuroblasts (cells of the ventricular layer) retain their ability to undergo mitosis after leaving the ventricular layer. This difference is achieved by increased hydrostatic forces acting on the neuroblasts.
In the brain, further layers are added to increase complexity. This is possible because in the anterior of the embryo, neuroblasts (cells of the ventricular layer) retain their ability to undergo mitosis after leaving the ventricular layer. This difference is achieved by increased hydrostatic forces acting on the neuroblasts.
'''Sensory Ganglion of Cranial Nerves''' - epithelial to mesenchymal transition.
'''Sensory Ganglion of Cranial Nerves''' - epithelial to mesenchymal transition.
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[[Category:Developmental_Biology]] [[Category:Nervous_System_-_Anatomy_&_Physiology]] [[Category:A&P_Done]] [[Category:David_Hogg_reviewing]]
[[Category:Developmental_Biology]] [[Category:Nervous_System_-_Anatomy_&_Physiology]] [[Category:A&P_Done]] [[Category:David_Hogg_reviewing]]