Lumbar Puncture - Spinal Cord Lumbar Puncture * The needle...

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Spinal Cord Lumbar Puncture * The needle is inserted between the arches of L3 and L4 . * This avoids any damage to the spinal cord . Cross-Section: Gray Matter Cross-Section: Gray Matter * The dorsal horn is a multi-layered structure. * The thin outermost layer is called the posterior marginalis layer. * The wide pale second layer is called the substantia gelatinosa , * and the layer deep to that is called the nucleus proprius . Cross-Section: White Matter Spinal Tracts * Columns consist of subdivisions called tracts or fasciculi * ascending tracts- carry sensory info up the cord * descending tracts- conduct motor impulses down the cord * Decussation- crossover * contralateral- when origin and destination are on opposite sides of the body * ipsilateral- on same side Ascending Tracts * Sensory signals typically travel across three neurons from origin to destination * first order neuron- detects stimulus and transmits to cord * second order neuron- relays form cord to thalamus in brain stem
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Lumbar Puncture - Spinal Cord Lumbar Puncture * The needle...

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