Nervous system 1

Organisation of spinal cord (dorsal column system, anterolateral system, corticospinal tract)

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  • Nervous System 1
    • Organisation of Spinal Cord
      • Nerve Pathways
        • Dorsal Column System
          • Ipsilateral
          • Light touch sensation and proprioception
          • Ascending
        • Anterolateral System
          • Contralateral
          • Lateral and medial corticospinal tract
          • Pain and temperature sensation
        • Corticospinal Tract
          • Contralateral (brainstem)
          • Motor descending pathway
    • Development of CNS and PNS
      • 2nd-4th Week
        • Formation of Neural Tube
          • CNS begins as a thickened plate of ectoderm (neural plate)
            • Neural crest cells lie on either side of neural plate
              • Neural crest cells migrate away from the neural tube
                • Neural plate becomes the neural groove which forms the neural tube and canal
                  • Neural tube forms the CNS
                    • Rostral part forms the brain
                    • Caudal part forms the spinal cord
                  • Neural Canal forms the hollowness in the brain
                    • Brain Ventricles
                    • Central canal of spinal cord
                • Neural crest cells form the PNS
                  • Dorsal root ganglia of spinal nerves
                  • Comparable ganglia of cranial nerves
                    • Dorsal root ganglia of spinal nerves
                  • Autonomic ganglia
                  • Secretory cells of the adrenal medulla
            • Neural plate becomes the neural groove which forms the neural tube and canal
              • Neural tube forms the CNS
                • Rostral part forms the brain
                • Caudal part forms the spinal cord
              • Neural Canal forms the hollowness in the brain
                • Brain Ventricles
                • Central canal of spinal cord
      • 4th week
        • Development of brain vesicles
          • 1) Prosencephalon
            • Forebrain
            • P = Pre
            • Forms: thalamus, epithalamus, hypothalamus, subthalamus and cerebral hemispheres
          • 2) Mesencephalon
            • Midbrain
            • M = Middle
            • Forms: midbrain (eye movements and sensory functions)
          • 3) Rhombencephalon
            • Hindbrain
            • R = Rectum = Hind
            • Forms: medulla oblongata, pons and cerebellum
      • 4th-5th Week
        • Embryonic Folding
          • Neural tube bends to form two flexures between the primary vesciles
            • Cephalic flexure
              • Prosencephalon
              • Mesencephalon
              • 1) Prosencephalon
                • Forebrain
                • P = Pre
                • Forms: thalamus, epithalamus, hypothalamus, subthalamus and cerebral hemispheres
              • 2) Mesencephalon
                • Midbrain
                • M = Middle
                • Forms: midbrain (eye movements and sensory functions)
            • Pontine Flexure
              • Mesencephalon
              • Rhombencephalon
                • 3) Rhombencephalon
                  • Hindbrain
                  • R = Rectum = Hind
                  • Forms: medulla oblongata, pons and cerebellum

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