Neuro clinics 24 - spinal accessory

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Pratyush Chaudhuri

spinal accessory nerve

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1. Descending pathways 2. Types• direct pathways• indirect pathways . 3. • Most of the indirect pathways, sometimes called the extrapyramidal system, are involved in less precise control of motor functions, especially those associated with overall body coordination and cerebellar function such as posture.• Some indirect pathways, such as those from the basal nuclei and cerebellum, help in fine control of the direct pathways . 4. Direct Pathways• The direct pathways, also called the pyramidal (pi-rami-dal) system, are involved in the maintenance of muscle tone and in controlling the speed and precision of skilled movements.• Direct pathways are so named because upper motor neurons in the cerebral cortex, whose axons form these pathways, synapse directly with lower motor neurons in the brainstem or spinal cord

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