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Lecture 10: Brain Pathways: Movement

Lecture 10: Brain Pathways: Movement. Brain signals to the Body – Descending Pathways. Overview. Corticospinal Tract: Activation & Somatotopy Activity of Motor Cortex Neurons Directs Movement: Force & Direction Four Other Motor Pathways to Spinal Cord

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Lecture 10: Brain Pathways: Movement

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  1. Lecture 10: Brain Pathways: Movement • Brain signals to the Body – Descending Pathways

  2. Overview Corticospinal Tract: Activation & Somatotopy Activity of Motor Cortex Neurons Directs Movement: Force & Direction Four Other Motor Pathways to Spinal Cord Role(s) of Descending Pathways in Movement Control Effects of Corticospinal Tract Lesion Why is left right, and right left? Lecture X. Brain Pathways: Movement

  3. Outline • Corticospinal Tract -> Structure and Function • Pathways • Experiments • Phylogenetics • Crossing

  4. Corticospinal Tract (CST) – Nerve Bundle Cerebral Cortex

  5. Story: CST (Pyramidal) -> Structure and Function CST (6) -> Fine Movement Cortex -> anterior brain stem -> spinal cord (7,8)(p.201) Face, Neck, sacral (9) Where is it? Fine Movement; Specific points in motor cortex for specific movement (10,11,12,13) What does CST do? How does it Function? Sources for particular Movement Control (14,18) What are those parts? Rubro-, Tecto-, Vesibulo-, Reticulospinal (15,16,17) What are the pathways? Opposite limb loses dexterity (22) What if the CST is messed up? Neurons become less sensitive (23)

  6. Brain Evolution Cortex and cerebellum increase in size for a more refined system (26) Why are the pathways Crossed? Maintain a continuous image. Ensure Evasion (27,28)

  7. Today’s Story • Corticospinal Tract • What does it do? • What pathways does it entail? • What happens when it is disrupted?

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