lecture7updatedversion - NS 102 Review Ascending Tracts...

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1 NS 102 Review: Ascending Tracts Sehee Kim 10/26/06 1) Posterior Column- Medial Lemniscus 2) Lateral Spinothalamic (Anterolateral) 3) Posterior Spinocerebellar 4) Trigeminothalamic ASCENDING SYSTEMS Found primarily in the PNS Located in the sensory ganglia/ dorsal root ganglia Provide sensory input to spinal cord and brain stem Central process carries info away form the cell body Peripheal carries info towards the cell body Central process Peripheral process Pain Touch Temperature C N S One primary sensory afferent neuron…… DRG nerv e tract Many primary sensory afferent neurons! Posterior Column- Medial Lemniscus INFO TYPE •EPICRTIC TOUCH •KINESTHETICS FIBER TYPE •LARGE CALIBER •RAPIDLY CONDUCTING
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2 DRG Fasciculus Cuneatus Fasciculus Gracilis Nucleus Gracilis Nucleus Cuneatus VPL DRG Foramen magnum THIS SYSTEM MAKES TWO SYNAPSES EN ROUTE TO CORTEX….. ONE… DRG Fasciculus Cuneatus Fasciculus Gracilis Nucleus Gracilis Nucleus Cuneatus VPL DRG Foramen magnum TWO!! Fasciculus Cuneatus Fasciculus Gracilis DRG Large caliber rapidly conducting fibers enter at posterior root entry zone and immediately turn rostral in the posterior column without synapsing DRG LUMBOSACRAL DRG Fasciculus Cuneatus Fasciculus Gracilis DRG DRG CERVICAL/THORACIC DRG LUMBOSACRAL At the cervical level the posterior median septum divides the posterior column into two fascicles Fibers coming in from the lower body are added in medially as the fascs. gracilis Fibers coming in from upper body are added in laterally as the fasc. cuneatues DRG Fasciculus Cuneatus Fasciculus Gracilis Nucleus Gracilis Nucleus Cuneatus DRG Foramen magnum 1st synapse is at level of the medulla DRG Fasciculus Cuneatus Fasciculus Gracilis Nucleus Gracilis Nucleus Cunetus DRG Foramen magnum Axon of the first post synaptic cell crosses midline as the internal arcuate fibers INTERNAL ARCUATE
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3 DRG Fasciculus Cuneatus Fasciculus
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