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vertphys18 - Lecture 18 CNS vs PNS CNS brain and spinal...

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Lecture 18: CNS vs PNS: CNS: brain and spinal cord PNS: cranial nerves, spinal nerves… Sensory neurons that run from receptors to CNS, and motor neurons that run from CNS to muscles and glands Ex: PNS- muscle sensory receptor, flexor muscle Organization: Body- rostral: head, caudal: tail, dorsal: top, ventral: bottom Brain- dorsal/superior (top), ventral/inferior (bottom) Development of neural tube: 1. first layer: ectoderm. Has neural plate, which is the thickening of the ectoderm. Mesoderm: has notochord endoderm at bottom 2. neural groove develops in the neural plate, led by neural crest cells. The neural crest gives rise to many things like bone, ganglion, cartilage, adrenal gland, etc. 3. neural crest cells form neural crest in between ectoderm and neural tube 4. Ectoderm turns into developing ectodermis. The Neural crest splits up, develops into something else (like ganglion cell) Developing Fetus Brain: Prosencephelon: develops into optic vesicle, diencephalons, telencephalon, lateral ventricle, 3 rd ventricle
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