Divisions

• What does CNS consist of?

  spinal cord

  brain
• What does PNS consist of?

  Nerve fibres connecting CNS to effectors

  • carry nerve impulses to and fro CNS and fibres arranged into nerves that originate at brain and spinal cord including:
  • 12 cranial nerves, some mixed nerves
  • 31 pairs spinal nerves: ALL mixed
• how many spinal nerves?

  31
• how many cranial nerves?

  12
• what roots are spinal nerves connected to?

  ventral root: contains axons of motor fibres

  dorsal root: contains sensory fibres

  • Cell bodies of sensory fibres are contained within a small swelling in dorsal root; dorsal root ganglion
• what does spinal cord do?

  conducts signals to and from brain

  control reflex activities
• label the following

  A) central nervous system

  B) Efferent System, motor

  C) Afferent System (sensory)

  D) Autonomic Nervous: smooth cardiac

  E) somatic nervous system: skeletal muscle

  F) Sympathetic Nervous system

  G) parasympathetic system

  H) fight flight, dilates pupil of eye increase heart rate

  I) constricts pupil