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Descending Pathways

Desc. Pathway PPT

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
Tectospinal Tract From sup. colliculus/pre-tectal area above sup. colliculus Cross & desc close to MLF Neurons end in upper cervical AHCs
Function of Tectospinal tract Reflex postural adjustments related to visual stimuli; Fibers associated with SNS in lateral gray- pupillary reflex in response to darkness
Rubrospinal Tract In midbrain tegmentum- level of superior colliculus Cross & descend to SC
Function of Rubrospinal Tract Not entirely sure, may facilitate flexors & inhibit extensors
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
Raphe Nuclei (RF) Influence transmission of incoming sensory signals, motor responsiveness Influence pn transmission from peripheral nn, pre-ganglionic ANS & somatic motor nns
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)
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
MLF-Ascending in BS fibers interconnect vestibular & extraocular nuclei; coordination of eye mvmt, integration of head/eye mvmts
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
Function of the Lateral BS System Fine mvmts, discrete mvmt patterns; Facilitates flexors, inhibits extensors
Ventromedial BS system from nucleus of Cajal, sup. colliculus, mesencephalic, opntine & meduallary RF, & vestibular nuclei; Terminate in AHCs of axial/girdle mm
Function of Ventromedial BS system Maintenance of erect posture; integrate mvmts of body/limbs & progression mvmts of limbs; Facilitate extensors, inhibit flexors
Lateral Reticulospinal Functions Regulate ANS neurons in intermediolateral cell column
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
Created by: 1190550002



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