Nervous System

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Author:
Anonymous
ID:
101665
Filename:
Nervous System
Updated:
2011-09-14 13:44:48
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buspm
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Description:
Organization of the nervous system
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  1. CNS
    Brain & Spinal cord
  2. PNS
    • Afferent
    • Efferent
    • Somatic
    • Autonomic
    • Sympathetic
    • Parasympathetic
    • 12 pairs of cranial nerves
    • 31 pairs of spinal nerves
  3. Afferent
    • Sensory system
    • From receptors in periphery to CNS
  4. Efferent
    • Motor system
    • From CNS to effectors in periphery
    • Made up of Somatic & Autonomic
  5. Somatic
    From CNS to Skeletal muscles
  6. Autonomic
    • From CNS to smooth & cardiac muscles & glands
    • Made up of Sympathetic & Parasympathetic
    • Supplies viscera, glands, & smooth muscle of blood vessels and skin
  7. Parasympathetic
    • Cell bodies located in CNs
    • CN 3,7,10 and spinal nerves S 2,3,4
  8. Sympathetic
    • Thoracolumbar
    • Formed by T1-L2 and L3 contributing fibers
    • Preganglionic myelinated fibers from spinal cord enter white rami of sympathetic trunk then go through 1 of 3 paths
  9. 3 paths of fibers from spinal cord to sympathetic system
    • 1) Synapse: postganglionic sympathetic fibers leave through grey rami
    • 2) Go up chain and synapse at different level: superior, middle, and inferior cervical ganglion
    • 3) Goes through sympathetic trunk without synapsing: synapses with other ganglia outside the chain
    • a) T5-T9 greater splanchnic (celiac ganglion)
    • b) T10-T11 lesser splanchnic (superior messenteric ganglion)
    • c) T12 lowest splanchnic (aortico-renal ganglion)
    • d) L1-L2 lumbar splanchnics (inferior mesenteric ganglion)
  10. Cranial Nerves
    • 12 pairs
    • "On Old Olympus's Towering Tops A Friendly Viking Grew Vines And Hops"
    • CN1: Olfactory
    • CN2: Optic
    • CN3: Oculomotor
    • CN4: Trochlear
    • CN5: Trigeminal
    • CN6: Abducent
    • CN7: Facial
    • CN8: Vestibulocochlear
    • CN9: Glossopharyngeal
    • CN10: Vagus
    • CN11: Accessory
    • CN12: Hypoglossal
  11. 31 spinal nerves
    • All spinal nerves have both sensory and motor fibers except Cn1 which has only motor fibers
    • 8 cervical = Cn1-8
    • 12 thoracic= Tn 1-12
    • 5 lumbar= Ln 1-5
    • 5 sacral= Sn 1-5
    • 1 coccygeal= Con 1
  12. Spinal & Cranial nerves and the autonomic nervous system
    • parasympathetic: CN 3,7,9,10 and spinal nerves 2,3,4
    • sympathetic: Tn1-Ln2
  13. Cranial nerves and information path
    • CN1: sensory
    • CN2: sensory
    • CN3: motor
    • CN5: mixed
    • CN11: motor
    • CN12: motor
  14. Dorsal Root
    Sensory fibers
  15. Ventral Root
    Motor fibers
  16. Dorsal Ramus
    Sensory and motor fibers
  17. Ventral Ramus
    Sensory and motor fibers
  18. Root value of a nerve
    • spinal nerves contributing to that nerve's formation
    • EX: Sciatic nerve= Ln4, Ln5, Sn1, Sn2, Sn3
    • EX: Phrenic nerve= Cn3, Cn4, Cn5

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