BIO380H5 Lecture Notes - Lecture 19: Cephalic Flexure, Neural Tube, Cerebellum

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30 Oct 2016
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Skeletal muscles cannot contract without the nervous system. It starts to develop at neurulation during the folding of the neural plate. The neural plate folds in the presence of the somites, both anteriorly and posteriorly leaving the neuropores. The cephalic neuropore closes two days earlier than the posterior: on the 24th day the cephalic neuropore closes, on the 26th day the caudal neuropore closes. At the end of the third week of development, the embryo begins to bend: there is a bend called the cephalic flexure. It is situated between the midbrain and the pons. At the beginning of the fifth week of development when the neural tube is closed, the cervical flexure is present. It is situated between the rhombencephalon and the spinal cord. The neural tube is divided into : prosencephalon thalamus, hypothalamus, cerebral hemispheres, mesencephalon midbrain, rhombencephalon medulla oblongata, cerebellum, pons, spinal cord. The brain will increase in size while the spinal cord will just elongate.

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