Balanceacceleration controls limb muscles tthat

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Unformatted text preview: pinal Fasciculus gracilis Fasciculus gracilis The majority of the fibers do not The majority of the fibers do not synapse until they rreach the medulla. synapse until they each the medulla. synapse These fibers arise in dorsal root ganglia These fibers arise in dorsal root ganglia off sacral and lumbar segments of the o sacral and lumbar segments of the spinal cord. spinal cord. Presynaptic ffibers are routed to the Presynaptic fibers are routed to the Presynaptic ibers are nucleus gracilis. nucleus gracilis gracilis. The gracile nucleus lies medial to the The grac nucleus lies medial to the gracile nucleus cuneate nucleus on each side. cuneate nuc leus on each side. cuneate nuc on The postsynaptic paths of cuneatus and neatus The postsynaptic paths of cuneatus and gracilis are parallel from tthis point. grac ilis are parallel from his point. grac are parallel When 3° gracilis axons reach cerebral When 3° gracilis axons reach cerebral When axons cortical llevel, they are directed to tthe o he cortical evel, tthey are directed tto the ortical hey dorsal side off tthe cerebral hemisphere, dorsal side o the cerebral hemisphere, he whereas tthe cuneate data is sent to the whereas he cuneate data is sent to the cuneate data llateral and ventral part of the gyrus. ateral and ventral part of the gyrus gyrus. Spinal Sensory Pathways Spinal fasciculus cuneatus ffasciculus cuneatus asciculus Cuneate axons ascend iin the dorsal cord on Cuneate axons ascend n tthe dorsal cord on he Cuneate axons tthe ipsilateral side and synapse in the nucleus psilateral side he iipsilateral side and synapse in the nucleus cuneatus in the dorsal lateral medulla. cuneatus in the dorsal lateral medulla. cuneatus Postsynaptic fibers cross immediately to the Postsynaptic fibers cross immediately to the contralateral siide via bands of axons known as contralateral s de via bands of axons known as contralateral bands axons tthe 'internal arcuate ffibers' and enter the he 'internal arcuate fibers' and enter the arcuate ibers' massive ascending pathway,, tthe medial massive ascending pathway he medial lemniscus. llemniscus emniscus. Lemniscal axons ascend without synapse until Lemniscal axons ascend without synaps until Lemniscal axons synapse until tthey reach tthe ventral posterior latera...
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This note was uploaded on 12/08/2011 for the course AMY 2A taught by Professor Jamesivey during the Spring '06 term at Riverside Community College.

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