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Motor Nerve Tracts

Tract NameFunctionOriginCourseTerminationLaterality
Corticospinal Tract Fine movements, Flexor bias primary motor cortex post limb IC, cerebral peduncle, long. fibers of pons, pyramids, decussate, spinal cord (90% lat, 10% ant) spinal cord ventral horn/ventral gray Contra (lat), Ipsi (med)
Rubrospinal Tract gross movements, cervical, flexor bias (arms,shoulders,neck) red nucleus dorsal tegmentum w/LCST in spinal cord spinal cord ventral horn/ventral gray, cervical levels only Contra (crosses in ventral tegmental decussation)
Tectospinal Tract Reflexive movements of head and neck with eyes superior colliculus runs ventral to the median longitudinal fasiculus/MVSt/ventromedial spinal cord spinal cord ventral horn/ventral gray, cervical levels only Contra (crosses in tegmental decussation
Lateral Vestibulospinal Tract balance of trunk, limb girdle, and proximal limbs, extensor bias lateral vestibular nucleus not clear, ventromedial spinal cord ventray gray Ipsi
Medial Vestibulospinal Tract Balance of head and neck, extensor bias medial vestibular nucleus runs in the MLF below CN VI, ventromedial spinal cord ventral gray, cervical and high thoracic bilateral
Pontine Reticulospinal Tract postural/axial movemtn and muscle tone, extensor bias pontine reticular formation ventromedial spinal cord ventral gray ipsi
Medullary Reticulospinal Tract postural/axial movement and muscle tone, flexor bias meduallary reticular formation dorsolateral spinal cord (with RST and LCST) ventral gray bilateral, with and ipsi bias
Corticopontine Tract Brings informaiton from cortex to pons (eventuall to MCP) primary motor cortex, premotor cortex, primary somatosensory cortex, etc. ant limb of IC, post limb of IC, cerebral peduncles, pons pontine nuclei ipsi
Corticobulbar Tract motor input to cranial nerve nuclei, reticular formation and red nuclei primary motor cortex (face portion) genu of IC, cerebral peduncle, long. fibers of pons, pyramids motor nuclei of cranial nerves, red nucleus, reticular formations All bilateral, except: *Lower face of CN VII and CN XII: contra *Red Nucleus: ipsi *Reticular Formation: contra
Created by: jdiesel23