Desc. Pathway PPT
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| Reticulospinal Tract | RF= scattered cell groups
Pons- axons to SC as pontine reticulospinal tract
Medulla-axons to SC as medullary reticulospinal tract
Both tracts neurons enter AHC, influences AMN/GMN, thus voluntary mvmts/reflexes
Desc. ANS- hypothalamus control SNS/PNS
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| Tectospinal Tract | From sup. colliculus/pre-tectal area above sup. colliculus
Cross & desc close to MLF
Neurons end in upper cervical AHCs
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| Function of Tectospinal tract | Reflex postural adjustments related to visual stimuli;
Fibers associated with SNS in lateral gray- pupillary reflex in response to darkness
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| Rubrospinal Tract | In midbrain tegmentum- level of superior colliculus
Cross & descend to SC
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| Function of Rubrospinal Tract | Not entirely sure, may facilitate flexors & inhibit extensors
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| Vestibulospinal Tract | Lateral vestibular nucleus->axons->lateral VST
descend uncrossed through medulla & SC
Internns to AHCs inhibit flexors, facilitate extensors to maintain balance
Medial VST- only to C-spine, crossed, neck/head position mm
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| Raphe Nuclei (RF) | Influence transmission of incoming sensory signals, motor responsiveness
Influence pn transmission from peripheral nn, pre-ganglionic ANS & somatic motor nns
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| Spinal & Ceruleus Spinal Projections | No mvmt, produce general excitatory/inhibitory effects that influence motor neuron response of CST to reflex-producing inputs (sleep-wake cycles & emotional changes)
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| MLF- Descending in SC | pontine (medial) RST & medial VST;
Supplies upper cervical;
SC- MLF contains tectospinal tract (doesn't in the BS);
Modulates reflex mvmts of head/neck in response to visual/vestibular stimuli
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| MLF-Ascending in BS | fibers interconnect vestibular & extraocular nuclei;
coordination of eye mvmt, integration of head/eye mvmts
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| Lateral BS System | Fibers from contralateral red nucleus to SC via rubrospinal tract;
Fibers from ventrolateral contralateral pontine & meduallary tegmentum via lateral columns of SC; ends in AHCs & DHCs
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| Function of the Lateral BS System | Fine mvmts, discrete mvmt patterns;
Facilitates flexors, inhibits extensors
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| Ventromedial BS system | from nucleus of Cajal, sup. colliculus, mesencephalic, opntine & meduallary RF, & vestibular nuclei;
Terminate in AHCs of axial/girdle mm
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| Function of Ventromedial BS system | Maintenance of erect posture; integrate mvmts of body/limbs & progression mvmts of limbs;
Facilitate extensors, inhibit flexors
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| Lateral Reticulospinal Functions | Regulate ANS neurons in intermediolateral cell column
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| Propriospinal Paths | from dorsal & ventral horn neurons, travel in white matter;
link segments of SC to integrate local reflexes to coordinate body mvmts & visceral fxn
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