Peripheral Nerves and Plexuses

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  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....
    Rami
  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...
    Parasympathetic
  24. Thoracic and lumbar innervate this nervous system....
    Sympathetic
  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

Card Set Information

Author:
 amills1
ID:
 235891
Filename:
 Peripheral Nerves and Plexuses
Updated:
2013-09-20 01:14:51
Tags:
Neuro Nerves Plexus Plexuses
Folders:

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