nervous system

• what is the nervous system

  • divided into the CNS and the PNS
• what is the CNS

  • central nervous system
  • consists of the brain and spinal cord where all the complex processing of information is done and decisions are made
• what is the PNS

  • peripheral nervous system
  • brings information from the SENSES to the CNS
  • transmits information from the CNS to MUSCLES and GLANDS
• how many areas can the brain be divided into?

  4

  -cerebrum

  -cerebellum

  -diencephalon

  -brain stem
• what is the cerebrum: brain areas

  • largest part of the brain
  • divided into 4 lobes
  • split down the middle into the 2 hemispheres which communicate with each other
• what is the cerebellum:brain areas

  • controls persons motor skills and balance
  • coordinates muscles
  • allows precise movements
• what its he diencephalon: brain areas

  • contains thalamus which relays nerve impulses from senses to appropriate part of the brine
  • regulates body temperature, hunger, endocrine system
• what is the brain stem- brain areas

  • regulates automatic functions (heart rate, breathing)
  • motor and sensory neurone travel through the brains stem allowing impulses to pass between brain and spinal cord
• what does the peripheral nervous system consist of?

  • somatic nervous system
  • autonomic nervous system
  • sympathetic nervous system
  • parasympathetic nervous system
• what is the somatic nervous system?

  • part of the peripheral nervous system
  • receives information from the senses and transmits it to the CNS
  • transmits information from the CNS to muscle movement
• what is the role of the spinal cord in the CNS?

  • relay info from brain to rest of body
  • allows brain to regulate body processes
• what is the peripheral nervous system?

  • all nerves outside the CNS
• identify 2 components of the PNS and their differences in their organisation/functions

  • SOMATIC NS - controls voluntary actions controls skeletal muscles, only has 1 part, sensory and motor pathways
  • AUTONOMIC NS - controls involuntary actions, controls smooth muscles, divided into sympathetic and parasympathetic, only has motor pathways