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Nervous System

Nervous System. Functions : Homeostasis Memory Senses Components : Brain, Spinal Cord, Nerves, receptors, ganglia, tracts. Can be organized anatomically and physiologically. Overview of the Nervous System. Physiologically : Afferent (Sensory) receptors Efferent (Motor)

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Nervous System

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  1. Nervous System

  2. Functions: Homeostasis Memory Senses Components: Brain, Spinal Cord, Nerves, receptors, ganglia, tracts Can be organized anatomically and physiologically

  3. Overview of the Nervous System

  4. Physiologically: Afferent (Sensory) receptors Efferent (Motor) somatic autonomic Sympathetic Parasympathetic Anatomically: Central: Brain Spinal Cord Peripheral: Nerves Receptors Ganglia

  5. There are 2 types • of cells in the • Nervous System: • Neurons • Neuroglial cells

  6. The Neuron

  7. A Typical Neuron • Dendrites • incoming • Cell Body • integration • Axon • output • Axon Terminal • release of neurotransmitter Nodes of Ranvier

  8. Neurons can be categorized by the number of processes and function

  9. All or None Spatial Summation different all at once Temporal summation one many times in concession

  10. The Biochemistry of the Synapse

  11. The Neuroglial Cells Neuroglial Cells

  12. Saltatory Conduction

  13. Tay Sachs Multiple Sclerosis Gray matter White matter

  14. Nervous System Terminology Gray Matter – mostly nerve cell bodies. White Matter – mostly myelinated axons. Nerve fiber – a single axon of a neuron. Nerve – a bundle of axon in the PNS. Tract – a bundle of axon ins the CNS. Ganglion – a cluster of nerve cell bodies in PNS. Nucleus – gray matter in CNS with common function.

  15. Sulci (sulcus) – grooves on surface of cerebrum. • Gyri (gyrus) – fold of brain tissue between sulci. • Fissure - deep groove, separating hemispheres. Three kinds of cerebral functional area: • 1) Sensory areas • 2) Association areas • 3) Motor areas

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