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ANAT 1615 Development of the Back Structures

ANAT 1615 Development of the Back Structures - I...

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I. Development of the Back Structures A. Neural tube formation. 1. the notochord induces the overlying ectoderm to differentiate into neuroectoderm which forms the neural plate. 2. The neural plate (neuralectoderm) then folds and forms the neural groove which fuses to form the neural tube. When folding, some cells become neural crest cells. 3. The brain developes from the cranial swelling of the neural tube. 4. The spinal cord developes from the caudal neural tube. 5. Neuroblasts form all neurons within brain and spinal cord, including preganglionic sympathetic and parasympathetic neurons. B. Neural crest cells 1. Develop from junction of neural tube and ectoderm 2. They give rise to the dorsal root ganglion, autonomic ganglion, and adrenal medulla. C. Meninges 1. Dura mater arises from mesoderm 2. Pia mater and arachnoid membrane arise from neural crest cells D. Development of Back Muscles 1. Somites give rise to myotomes which then become the epimere and hypomere.
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