Usually have myelin ffirst order neurons synapsis

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Unformatted text preview: s Postsynaptic (second order) neurons decussate to form the ascending decussate to form the ascending spinothalamic tract. spinothalamic tract. spinothalamic They ascend through the lower brain They ascend through the lower brain stem in the medial lemniscus. emniscus stem in the medial llemniscus. Spinal Sensory Pathways Spinal Dorsal and Ventral Spinocerebellar Dorsal and Ventral Spinocerebellar Spinocerebellar Pathways Pathways Spinocerebellar ffibers carry Spinocerebellar fibers carry Spinocerebellar ibers proprioceptive signals from the limbs proprioceptive signals from the limbs proprioceptive signals and trunk to the cerebellum and trunk to the cerebellum and After synapsing iin the dorsal gray horn, After synapsing in the dorsal gray horn, synapsing n 2° axons ascend in the dorsal orr ventral n he 2° axons ascend iin tthe dorsal or ventral axons o spinocerebellar ttracts.. spinocerebellar tracts. spinocerebellar racts dorsal tract ttravel ipsilateral psilateral dorsal tract ravel iipsilateral ventral cross, ascend, cross back in ventral cross, ascend, cross back in brainstem tto enter ipsilateral psilateral brainstem to enter iipsilateral o Cerebellum Cerebellum enter the cerebellum as mossy fibers, enter the cerebellum as mossy fibers, enter and the next llevell of synapses iis tthere, and the next lev e of synaps es is there, next ev of synaps s here, iin the deep cerebellar nuclei and onto n the deep cerebellar nuc and onto cerebellar nuclei and tthe granule cells off tthe cerebellar cortex he granule cells o he cerebellar cortex cerebellar cortex Spinal Sensory Pathways Spinal Spinotectal tract— tract— iin terms of receptors, this is a n terms of receptors, this is a spinothalamic subdivision, but it spinothalamic subdivision, but it synapses in the sup. colliculus synapses in the sup. colliculus colliculus of the mesencephalon, rather of the mesencephalon rather mesencephalon, tthan continuing to the thalamus. han continuing to the thalamus. Functionally, it tr...
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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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