Pathways, vestibular, ocular
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| What do descending motor pathways control and what changes are seen after damage? | show 🗑
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| show | Reticulospinal, vestibulospinal, tectospinal, corticospinal tracts -> control the axial skeleton via bilateral innervation of alpha motoneurons
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| show | 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
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| show | From lateral vestibular nuclei (medulla/pons) -> inputs from vestibular balance organs -> output antigravity actions for eqbm -> bilateral axial skeleton extensor muscles
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| What does the tectospinal pathway control? | show 🗑
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| show | 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)
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| show | Midbrain cerebral peduncles (ipsilateral) -> columns, pons -> variable position, medulla (10% don't decussate) -> pyramids, spinal cord -> corticospinal tract
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