quiz #2- motor systems 1

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BPT
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69093
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quiz #2- motor systems 1
Updated:
2011-02-26 16:30:40
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neuroscience
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lateral activating, medial activating
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  1. In general where do UMN deliver information to?
    descending tracts (w/ UMN axons) from cortical and brainstem centers (supraspinal centers) carry movement information from the brain to LMN (alpha and gamma) and to interneurons
  2. Where are the three places UMNs terminate on and where?
    • Alpha (LMN)
    • Gamma (LMN)
    • interneurons
    • all terminate in the ventral cell column (medial, lateral, throughout)
  3. How is the ventral cell column organized?
    • SOMATOTOPICALLY
    • distal muscles=later
    • proximal muscles=medial
    • extensor muscles=anterior
    • flexor muscles=posterior
  4. What are key factors of the medial activating system in general (function, location, etc.)?
    • posture and gross movement of the trunk
    • primarily in white matter of anterior funiculus
    • proximal musculature & extensors
  5. What are key factors of the lateral activating system in general (function, location, etc.)?
    • fine motor movement, fractionation
    • descends in lateral funiculus of SC
    • distal musculater and flexors
  6. Which tracts of the Medial Activating system are bilateral?
    • Medial Vestibulospinal tract
    • Medial (anterior) Corticospinal tract
  7. What tracts of the Medial activating system are ipsilateral?
    • Pontine (medial) reticulospinal tract
    • Lateral vestibulospinal tract
  8. What is the origin, termination, function, & cortical input of the tectospinal tract?
    • Origin: tectum
    • Termination: cervical medial motor column cells
    • Function: orients head toward auditory, visual or somatosensory nuclei
    • Cortical Input: rapid fire so doesn't travel all the way to cortex, but it does have some input
    • CONTRALATERAL
  9. What is the origin, termination, and function of the Pontine (medial) reticuospinal tract?
    • Origin: reticular formation of pons
    • Termination: medial motor column cells
    • Function: facilitates axial and proximal muscle extensors
    • Cortical Input: input keeps you standing straight up, not falling
    • IPSILATERAL
  10. What is the origin, termination, function, & cortical input of the Medial Vestibulospinal Tract?
    • Origin: medial vestibular nucleus of pons
    • Termination: medial motor column cells
    • Function: facilitates trunk and neck extensors, senses off balance from the ear
    • Cortical input: very litte
    • BILATERAL
  11. What is the origin, termination, function, & cortical input of the Lateral Vestibulospinal Tract?
    • Origin: lateral vestibular nucleus of the pons
    • Termination: medial motor column cells
    • Function: facilitates extensors, inhibits flexors, postural musculature to keep you upright
    • Cortical input: ---
    • IPSILATERAL
  12. What is the origin, termination, function, & cortical input of the medial (anterior) Corticospinal Tract?
    • Origin: trunk area of precentral gyrus
    • Termination: medial motor column cells
    • Function: facilitates extensors of axial and prximal musculature, prepares postural system for movement (trunk stability for distal mobility)
    • Cortical input: ---
    • BILATERAL
  13. What is the origin, termination, and function of the Lateral Corticospinal Tract?
    • Origin: premotor (30%), primary motor (40%), and somatosensory (30%)
    • Termination: cells controlling limb flexors
    • Function: fractionation, discrete muscle activity
    • CONTRALATERAL
  14. What is the origin, termination, and function of the Rubrospinal Tract?
    • Origin: red nucleus of midbrain
    • Termination: lateral motor column cells
    • Function: facilitates upper limb flexor movements
    • CONTRALATERAL
  15. What is the origin, termination, and function of the Medullary Lateral Rectospinal Tract?
    • Origin: medullary recticular formation
    • Termination: lateral motor column cells
    • Function: inhibits spinal mortor neurons and has a role in modification of motor neural pool
    • BILATERAL
  16. What are the five medial activating systems?
    • tectospinal tract
    • pontine (medial) rectospinal tract
    • medial vestibulospinal tract
    • lateral vestibulospinal tract
    • medial (anterior) corticospinal tract
  17. What the three lateral activating systems?
    • lateral corticospinal tract
    • rubrospinal tract
    • medullary (lateral) rectospinal tract
  18. What are the two non-specific systems?
    • raphespinal
    • cerulospinal
  19. What is the origin and function of the cerulospinal tract?
    • Origin: locus ceruleus in the brainstem
    • Function: enhances activity of interneurons and motor neurons of SC
  20. What is the origin and function of the Raphespinal tract?
    • Origin: raphe nucleus in the brainstem
    • Function: enhances activity of interneurons and motor neurons of SC
  21. What tract does the corticobulbar tract travel with?
    lateral corticospinal tract
  22. Where does the corticobulbar tract terminate?
    • nuclei of cranial nerves
    • III, IV, V, VI, VII, XI, XII, IX, X
  23. Projections of the corticobulbar tracts are primarily IPSI, CONTRA, or BI- lateral?
    BILATERAL
  24. What are the exceptions to the projections of the corticobulbar tract?
    • IV: ipsilateral
    • VII: upper face bilateral, lower face contralateral
    • XI: contralateral
    • XII: contralateral
  25. What is interesting about the trochlear nerve?
    IV: it is the only peripheral nerve to cross the midline
  26. What does the facial nerve control?
    VII: sagging of the face
  27. What does the Hypoglassal nerve control?
    XII: sticking out the tongue
  28. What does the Spinal Accesory Nerve Control?
    XI: SCM and trap

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