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Nervous System

Nervous System. …the brain…. Nervous System. …the brain…. Nervous System. …the brain…. Nervous System. …the brain…. Nervous System. Peripheral Nervous System. Nerve fibres carrying msgs to/from CNS & groups of nerve cell bodies (ganglion). Nervous System.

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Nervous System

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  1. Nervous System …the brain…

  2. Nervous System …the brain…

  3. Nervous System …the brain…

  4. Nervous System …the brain…

  5. Nervous System Peripheral Nervous System

  6. Nerve fibres carrying msgs to/from CNS & groups of nerve cell bodies (ganglion) Nervous System Cranial Nerves: 12 pairs of nerves arising from brain (eg optic nerve, auditory nerve) most mixed, some single. Spinal Nerves: 31 pairs of mixed nerves each joined to the spinal cord by two roots. Peripheral Nervous System 1. Ventral Root: axons of motor neurons with cell bodies in grey matter of spinal cord 2. Dorsal Root: axons of sensory neurons with cell bodies in small swelling on dorsal root (dorsal root ganglion)

  7. Divisions: Afferent (sensory) Division: Nervous System Efferent (motor) Division: Somatic (voluntary) Division: Autonomic (involuntary) Division: Peripheral Nervous System Sympathetic (preparation) Division: Parasympathetic (maintenance) Division:

  8. Reflex is a rapid, automatic response to a change in the internal / external environment (homeostasis) Nervous System Reflex Arc or Spinal reflex arc: Receptor: Sensory Neuron: Spinal reflexes Synapse: Motor Neuron: Effector:

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