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NERVOUS SYSTEM I

NERVOUS SYSTEM I. CNS (Central Nervous System) Segmentation PNS (Peripheral Nervous System) Spinal Nerves Neuron Types Autonomic Nervous System (how many nervous systems are there anyways?). Central Nervous System (CNS). Brain and Spinal Cord “Command Central”

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NERVOUS SYSTEM I

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  1. NERVOUS SYSTEM I • CNS (Central Nervous System) • Segmentation • PNS (Peripheral Nervous System) • Spinal Nerves • Neuron Types • Autonomic Nervous System (how many nervous systems are there anyways?)

  2. Central Nervous System (CNS) • Brain and Spinal Cord • “Command Central” • PNS (Peripheral Nervous System) are nerves that go out to targets in body

  3. Coronal Section Cartoon • Brain • Cranial Cavity of Skull • Spinal Cord • Vertebral Arches • Cranial Nerves I-XII (off brain) • Spinal Nerves • C--8 prs (L,R) • T--12 prs • L--5 prs • S--5 prs

  4. Counting Body Segments(vertebrae versus nerves) • Why are there seven cervical vertebrae but eight cervical nerves?

  5. Transverse View (x-section) • vertebral body • vertebral arch • vertebral foramen • spinal cord

  6. Sagittal View • vetebral body, arch • intervertebral disc • spinal cord • spinal nerves (where?)

  7. Zebra-Man • Dermatomes • Each is sensory area of one spinal nerve

  8. Peripheral Nervous System (PNS) • All nerves that leave the CNS • Two Modalities: Somatic Visceral/Autonomic Sensory/Afferent (info. In) Motor/Efferent (commands out) (hint: SAME) Somatic Visceral/Autonomic --smooth mm. --heart --glands Parasympathetic Sympathetic

  9. Somatic Motor Neuron (PNS) (CNS)

  10. Sensory Neuron (PNS) (CNS)

  11. Visceral (Autonomic) Motor Neuron (PNS) (CNS)

  12. Segmental Spinal nerve(more in Nervous System II)

  13. Autonomic “Targets” • All have dual sympathetic and parasympathetic innervation • (more in N.S.II)

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