Jr nervous system
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  • 1. Junior Nervous System Janet. J. Nelson RN, CMA
  • 2. DID YOU KNOW?
    • The human brain is made up of a staggering 15 billion cells with about thousand billion connections between these cells. Yet it weighs less than 3 pounds.
    • At three pounds the brain makes up on 2% of the total body weight but consumes 25% of energy of the entire body
    • The spinal cord is less than 2 feet long but controls over 2 billion nerve cells.
    • The nervous system transmits impulses to the brain at the speed of 180 mph.
    • The brain is as soft as butter.
  • 3. Student Objectives
    • 1. Describe the functions of NS
    • 2. List the main divisions of NS
    • 3. Define & label neuron
    • 4. Differentiate between motor and sensory neuron
    • 5. Identify the parts of brain and spinal cord
    • 6. Describe and label functions of the parts of brain
    • 7.Describe and label functions of the spinal cord
    • 8. Identify disorders of the NS.
  • 4. How many nervous system/s are there?
    • One with two subdivisions:
    • CNS PNS
    PNS is further divided into autonomic and motor
  • 5. Afferent vs. Efferent Neurons too can be afferent, efferent or association
  • 6. Neurons vs.Neuroglia
    • Neurons: functional nervous cells
    • Neuroglia: nerve “glue”
  • 7. Nerve conduction animation
    • http://www.pennmedicine.org/encyclopedia/em_DisplayAnimation.aspx?gcid=000089&ptid=17
  • 8. Typical Neuron
    • AXON WITH MYELIN SHEATH
    CELL BODY DENDRITE
  • 9.  
  • 10. Review Game
    • http://msjensen.cehd.umn.edu/webanatomy/nervous/default.html
    • Please label the Neuron 2 Short and the Neuron structure short .
  • 11. CHARACTERISTICS OF NEURONS
    • IRRITABILITY:
    • CONDUCTIVITIY:
    • Sensory Neurons
    • Motor Neurons
    • Connecting Neurons
  • 12. Fun facts about neurons
    • Most specialized cell in animals
    • Longest cell
      • blue whale neuron
        • 10-30 meters
      • giraffe axon
        • 5 meters
      • human neuron
        • 1-2 meters
    Nervous system allows for 1 millisecond response time
  • 13. Neurons
    • Most nerves contain both motor and sensory fibers.
    • However; there are a few purely sensory nerves…..
  • 14. Neuron transmission terms
    • Electrochemical
    • Polarized
    • Depolarized
    • Action potential
        • Repolarized
        • Sodium-Potassium Pump
  • 15.  
  • 16.  
  • 17. Synapse
  • 18. Animation of neuron transmission
    • http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter14/animation__the_nerve_impulse.html
    • http://www.brainexplorer.org/neurological_control/Neurological_Neurotransmission.shtml#
  • 19. Jumping the synaptic gap
    • http://highered.mcgraw-hill.com/sites/0072495855/student_view0/chapter14/animation__transmission_across_a_synapse.html ??????
  • 20. Cocaine & other drugs
    • Scientist believe cocaine causes release of Dopamine and blocks it’s reabsorption.
    • Eventually the person makes no Dopmaine of own and is dependent on artificial supplementation with Cocaine.
  • 21. Did you know?
    • Adult human brain weighs about 3#.
    • Brain is the texture of cold oatmeal .
    • The brain itself cannot feel pain The brain is surrounded by loads of tissues, nerves and blood vessels that are plenty receptive to pain.
    • 80% of the brain is water.
  • 22. Meninges Dura Mater Arachnoid Pia Mater
  • 23.  
  • 24. Lumbar Puncture
  • 25. SPINAL DEFECTS Spinal Bifida Meningocele Myelomeningocele
  • 26.  
  • 27. CEREBRAL VENTRICLES
    • Lateral Venticles
    • Foramen of Monroe 3rd Ventricle Cerebral Aqueduct
    • 4 th Ventricle
    • Subarachnoid space
    • Returning to cranial venous supply by arachnoid villi
  • 28. ENCEPHALOCLE Sagittal, magnetic resonance imaging (MRI) scan through the midline shows brain heniation through the sphenoid into the nasal cavity (arrow).
  • 29. CEREBROSPINAL FLUID
    • Made in the choroid plexus from blood
    • Functions for protection and nutrition
  • 30. Brain
    • Three Parts-
      • Cerebrum
    • - Cerebellum
    • - Brain Stem
  • 31. Cerebrum
    • Convolutuions (gyri)
    • Sulci (sulcus
    • Fissures
    Three Parts- Cerebrum Cerebellum Brain Stem
  • 32. Cerebral Lobes
  • 33.  
  • 34. PATHOPHYSIOLOGY
    • Parkinson's Disease
    • Huntington’s Chorea (Disease)
  • 35. DIENCEPHALON (INTERBRAIN)
    • Thalamus
    • Hypothalamus
    • Epithalamus (pineal gland)
    The diencephalon is colored reddish-orange
  • 36. Cerebrovascular Accident 01/06/12
  • 37. CEREBELLUM 01/06/12
  • 38. BRAIN STEM 01/06/12 Notice the size of the Thalamus and position of brain stem
  • 39. SPINAL CORD
    • In cross section gray matter internally and white matter exteriorly
    • Spinal nerves (31) emerge laterally from cord
    01/06/12
  • 40. SPINAL CORD
    • Can you locate the:
    • Spinal cord?
    • Spinal nerves?
    • Cerebellum?
    • Dura mater?
    • Medulla Oblongate?
  • 41. CAUDA EQUINA
  • 42. SPINAL NERVES
  • 43. How a Reflex Happens
  • 44. CRANIAL NERVES I - Olfactory II - Optic III - Oculomotor IV - Trochlear V - Trigeminal VI - Abducens VII - Facial VIII - Auditory IX - Glossopharyngeal X - Vagus XI - Accessory XII - Hypoglassal
  • 45.
    • l
    Bell’s Palsy
  • 46. ANS
    • Sympathetic (Fight or Flight)
    • Parasympathetic
    • (Rest & Digest) or (Repair & Repose)
  • 47. Add photo of info sheet
    • l
  • 48. t
    • l
  • 49. t
    • l
  • 50. t
    • l