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Descending motor

Pathways, vestibular, ocular

TermDefinition
What do descending motor pathways control and what changes are seen after damage? Operation of spinal reflex systems -> cortical damage/stroke btwn cerebral cortex/brainstem -> spastic palsy, spinal damage/trauma btwn brainstem and spinal cord -> flaccid paralysis
What are the ventromedial descending pathways and what do they control? Reticulospinal, vestibulospinal, tectospinal, corticospinal tracts -> control the axial skeleton via bilateral innervation of alpha motoneurons
What does the reticulospinal tract control? From reticular formation -> cranial projection (wakefulness), caudal projection (postural mvmt for wakefulness) -> principal route for spinal CPG activation controlled by cerebral cortex -> whole body axial posture/mvmt
What does the vestibulospinal system control? From lateral vestibular nuclei (medulla/pons) -> inputs from vestibular balance organs -> output antigravity actions for eqbm -> bilateral axial skeleton extensor muscles
What does the tectospinal pathway control? From superior colliculus w/ map of contralateral visual space -> generates rapid sensory orientation mvmts (saccades) btwn head/eyes for visual information processing -> don't pass through thalamus (quick responses) -> axial oculomotor/neck muscles
What does the corticospinal tract control? From M1 -> part of the pyramidal tract -> voluntary motor control of axial skeleton -> most decussate (lateral corticospinal tract -> appendicular limbs), 10% of fibres don't decussate (anterior corticospinal tract -> axial trunk)
How does the position of the corticospinal tract fibres change throughout the brain? Midbrain cerebral peduncles (ipsilateral) -> columns, pons -> variable position, medulla (10% don't decussate) -> pyramids, spinal cord -> corticospinal tract
Created by: vykleung
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