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Neurogenesis - Anatomy & Physiology (view source)
Revision as of 13:32, 26 August 2008
, 13:32, 26 August 2008→Neural Plate Induction
==Neural Plate Induction==
==Neural Plate Induction==
*Cells of the ectoderm are directed to develop into either neural ectoderm or epidermis.
*How is this choice made?
*Formation of the '''neural ectoderm''' is the default pathway.
**Therefore, in order to make epidermis, a signal from the environment must be diverting cells from going down this default pathway.
**This signal comes from the lateral plate mesoderm (LPM) which directs ectoderm to become epidermis.
***The notochord (lying along the midline) secretes an antagonist to the factor of the LPM so that neural ectoderm is formed above the notochord.
*Therefore, in lateral regions ectoderm becomes epidermis and along the midline ectoderm becomes neural ectoderm.
==Primary Neuralation==
==Primary Neuralation==
==Secondary Neuralation==
==Secondary Neuralation==