Transcription of CHAPTER 12 CENTRAL NERVOUS SYSTEM
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CHAPTER 12 CENTRAL NERVOUS SYSTEM
Copyright 2010 Pearson Education, Inc. CHAPTER 12 CENTRAL NERVOUS SYSTEM Copyright 2010 Pearson Education, Inc. CENTRAL NERVOUS SYSTEM Embryonic Development Copyright 2010 Pearson Education, Inc. Figure Development of the neural tube from embryonic ectoderm (1 of 4). 1 The neural plate forms from surface ectoderm. Head Tail Surface ectoderm Neural plate Copyright 2010 Pearson Education, Inc. Figure Development of the neural tube from embryonic ectoderm (2 of 4). 2 The neural plate invaginates, forming the neural groove, flanked by neural folds. Neural folds Neural groove Copyright 2010 Pearson Education, Inc. Figure Development of the neural tube from embryonic ectoderm (3 of 4). 3 Neural fold cells migrate to form the neural crest , which will form much of the PNS and many other structures. Neural crest Copyright 2010 Pearson Education, Inc. Figure Development of the neural tube from embryonic ectoderm (4 of 4). Surface ectoderm Head Tail Neural tube 4 The neural groove becomes the neural tube, which will form CNS structures.
3 Neural fold cells migrate to form the neural crest, which will form much of the PNS and many other structures. Neural crest . ... Ventral root of first cervical nerve Trochlear nerve (IV) Middle cerebellar Pons peduncle Pyramid Decussation of pyramids (a) Ventral view Spinal cord
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