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10 Cards in this Set
- Front
- Back
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What are the 2 major components of the somatosensory system?
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1. Touch, Vibration, Proprioception
2. Pain and Temperature |
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The Dorsal Column-Medial Lemniscus pathway carries what type of fibers?
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Touch, Vibration, Proprioception (spinal cord)
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What is the path of the Dorsal Column-Medial Lemniscus/ Touch pathway?
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- Lower~ enters dorsal root T6/below and ascends via gracile tract, synapses on Gracile Nucleus
- Upper: enters dorsal root at T5 and above ascends via cuneat tract, synapses on cuneate nucleus **G and C nucleus at lower medulla - Both form internal arcuate fibers and cross at caudal medulla at sensory decussation - ascend in medial lemniscus - synapse on VPL of thalamus - travel through post internal capsule - terminate at Primary somatosensory (SI) cortex |
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What is the arrangement of the upper vs lower limb within the medial lemnicus?
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- upper more medial
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The primary somatosensory cortex includes which parts of the brain?
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- Dorsal postcentral gyrus
- post paracentral lobule |
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The Spinothalamic system carries what type of fibers?
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- fast pain and temperature
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What is the pathway of the Spinothalamic/Pain and Temperature?
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- Enter anywhere along spinal cord via dorsal rootlet
- enter at the Tract of Lissauer - synapse immediately at dorsal horn (Lamina I and V) - decussate immediately at Ant white commissure - ascend via spinothalamic tract (lat to medial lemniscus) - synapse at VPL - Terminate at primary sensory cortex |
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What is the arrangment of fibers from the pain/temperature pathway in the spinothalamic tract?
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- the more rostral the fiber entered, the more medial its fibers are
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What occurs when a lesion is within the medial lemniscus? the spinothalmics?
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Contralateral loss touch, proprioception, vibration
Contralateral loss pain and temp |
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What occurs when there is a lesion in the gracile/cuneat tract?
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- ipslateral loss touch, proprioception, vibration
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