Spinal Sensory Pathways

Spinal Sensory Pathways - Somatosensory Spinal Sensory...

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Somatosensory Spinal Sensory Pathways Dorsal and Ventral Spinocerebellar Pathways * Spinocerebellar fibers carry proprioceptive signals from the limbs and trunk to the cerebellum * After synapsing in the dorsal gray horn, 2° axons ascend in the dorsal or ventral spinocerebellar tracts. * dorsal tract travel ipsilateral * ventral cross, ascend, cross back in brainstem to enter ipsilateral Cerebellum * enter the cerebellum as mossy fibers, and the next level of synapses is there, in the deep cerebellar nuclei and onto the granule cells of the cerebellar cortex Spinal Sensory Pathways Spinotectal tract * in terms of receptors, this is a spinothalamic subdivision, but it synapses in the sup. colliculus of the mesencephalon, rather than continuing to the thalamus. * Functionally, it transmits typical spinothalamic impulses (touch) into the tectum , where it drives reflexes, aiming the head (gaze) at the location of sensory input on the body surface (a bee stings, you rapidly look at the bee!). Trigeminal somatic sensory system
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Spinal Sensory Pathways - Somatosensory Spinal Sensory...

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