Basic Nervous System

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Basic Nervous System

• HND Functional Anatomy

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The Nervous System

• THE NERVOUS SYSTEM
• THE RAPID COMMUNICATION SYSTEM OF THE BODY,
  (CARRYING ELECTROCHEMICAL IMPULSES).
• Functions of the nervous system-
• SENSATION - in internal external environment
• INTEGRATION - of sensory information
• CO-ORDINATION - of voluntary involuntary
  actions
• REGULATION - of peripheral structures systems
• HIGHER FUNCTIONS -

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CENTRAL NERVOUS SYSTEM (CNS)

• BRAIN, SPINAL CORD
• (Approx 95 body's neural tissue)
• Performs INTEGRATION
• CO-ORDINATION of nervous activity

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PERIPHERAL NERVOUS SYSTEM (PNS)

• ALL OF NEURAL TISSUE OUTSIDE CNS
• Links CNS with all of body tissues outside world

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HISTOLOGY OF THE NERVOUS SYSTEM

• There are two basic types of cell within the
  nervous system
• NEURONE - basic functional unit of the nervous
  system. Specialised for conduction of NERVE
  IMPULSES.
• NEUROGLIA - involved in support and protection
  within the nervous system.

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Motor Neuron (efferent)multi-polar and
efferentrelays information from the CNS to the
periphery
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Motor Neuron

• Cell body
• Dendrites
• Axon Hillock (AP)
• Myelinated fibre
• Schwann Cell
• Node of Ranvier
• Synaptic Bulb

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Nerve impulse propagation

• Axon Hillock
• Resting Membrane Potential
• Membrane Potential
• Threshold
• Depolarisation
• Repolarisation