Peripheral Nerves and Plexuses

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Peripheral Nerves and Plexuses
2013-09-19 21:14:51
Neuro Nerves Plexus Plexuses

Brief description of the nerves and plexuses from first neuro handout
Show Answers:

  1. How many pairs of nerves?
    • 31 total pairs
    • Cervical 8 (C1-C7 exit above, C8 below C7)
    • Thoracic 12
    • Lumbar 5
    • Sacrum 5
    • Coccygeal 1
    • All exit below corresponding vertebra besides C1-C7
  2. Thoracic Nerves splint into a posterior and anterior....
  3. Cervical Plexus
    • C1-C4 spinal nerves
    • Innervate deep muscles of neck, anterior neck, levator scapula, SCM and traps
  4. Phrenic Nerve
    • C3-C5
    • Only innervation of diaphragm for motor and main sensory
  5. Brachial Plexus
    • Anterior primary rami of C5-T1.
    • Provides motor and sensory.
    • Innervation to muscles from multiple roots (nerves overlap innervation locations)
  6. Musculocutaneous
    • Thoracic
    • Elbow flexion
  7. Axillary
    • Thoracic
    • Deltoid
    • Teres minor
  8. Radial
    • Thoracic
    • Extension of elbow, wrist, and fingers
  9. Median
    • Thoracic
    • Forearm pronation
    • Wrist and finger flexion
    • Thumb abduction and opposition
  10. Ulnar
    • Thoracic
    • Wrist and finger flexion
    • Finger abd/add
  11. Lumbosacral Plexus
    • Anterior primary rami of L1-S3
    • Muscles of thigh, lower leg, and foot
  12. Obturator
    Hip adduction
  13. Femoral
    • Hip flexion
    • Knee extension
  14. Superior Gluteal
    • TFL
    • Glute med/min
  15. Inferior Gluteal
    Glute max
  16. Sciatic Nerve
    • Hamstring
    • Hip extension
    • Knee flexion
  17. Common Peroneal
    • Comes off of sciatic
    • Anterior and lateral leg
    • Dorsum of foot
  18. Tibial
    • From sciatic
    • Posterior of leg
    • Plantar Flexion Foot
  19. Efferent Peripheral Nerve Fiber
    • Large cel body
    • Multiple branched dendrites and long axon
    • Cell bodies in anterior horn
  20. Afferent Peripheral Nerve Fiber
    • Long dendrite originating in skin, tendon or GTO
    • Travels to cell body in dorsal root ganglion
    • Travels through dorsal root of spinal nerve into SC thru dorsal horn
    • Can terminate at horn or enter white matter fiber tracts and ascend
  21. GTO
    • Golgi tendon organ
    • Encapsulated nerve endings found at musculotendenous junction
    • They're sensitive to tension with in muscle tendons and transmit this info to SC
  22. SNS
    • Sympathetic Nervous System
    • Dilates lungs and contricts blood
    • Flight or fight response
    • Norepinephrine (neurotransmitter) controls circulation
    • HR and BP increase
    • Increase blood flow to muscles
    • Decreased blood flow to GI
  23. Cranial and Sacral dominate the innervation for this nervous system...
  24. Thoracic and lumbar innervate this nervous system....
  25. PNS
    • "Rest and digest" or "feed and breed"
    • Maintain vital body function/homeostasis
    • Info recieved from brainstem and from lower sacral segment of SC
    • Relates to CNIII, VII, IX, X
  26. CN X
    • Vagus
    • Innervates myocardium and smooth muscles of lungs and digestive tract
    • Stimulation causes bradycardia, decreased stroke volume, increase of mucus, peristalsis and glandular secretions.
  27. PNS Sacral Components
    • Bowel
    • Bladder
    • Sexual arousal
  28. Acelylcholine
    Produces vasodilatation reversing SNS
  29. Brain requires constant circulation due to...
    Requires readily available glycogen for energy since it cannot create its own