Term
| cerebral cortex/consciously |
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Definition
| Information that reaches the thalamus in the DCML pathway is relayed to the ? and perceived consciously or unconsciously. |
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Term
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Definition
| Information the cerebellum is used in regulation of ?; we are or are not consciously aware of cerebellar activity. |
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Term
| sensory/conscious/unconscious |
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Definition
| Ascending spinal tracts transmit impulses concerned with specific sensory or motor modalities ultimately to the ? for conscious perception or to the ? for unconscious perception. |
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Term
Dorsal Column/Medial Lemniscus (DCML)
pathway |
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Definition
| The ? pathway (ascending) carries information concerned with touch - pressure, kinesthesia, vibratory sense and 2 point discrimination. |
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Term
| Pacinian Corpuscles, Joint receptors, Meissners Corpuscles, Golgi Tendon Organs, and Muscle Spindles. |
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Definition
| The sensory receptors involved in the Dorsal Column/Medial Lemniscus pathway include (name the 5) |
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Term
| Dorsal Column/Medial Lemniscus (DCML) Pathway |
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Definition
| Pacinian Corpuscles and Meissners Corpuscles are 2 of the sensory receptors involved in this ascending spinal tract. |
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Term
| Dorsal Root Ganglion cells |
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Definition
| Peripheral processes of ? cells provide axons to the sensory receptors of the DCML pathway. |
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Term
| sacral/cervical/lumbar & thoracic |
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Definition
| There is a somatotopic organization to the posterior funiculus in the DCML pathway such that ? fibers are more medial and posterior, ? fibers are more lateral and ? and ? fibers occupy intermediate positions. |
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Term
| Posterior Intermediate Septum |
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Definition
| The posterior funiculus on each side is divided by the ? above T6 into 2 separate fasciculi. |
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Term
| T6/Fasciculus Gracilis and Fasciculus Cuneatus. |
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Definition
| The Posterior Intermediate Septum divides the posterior funiculus into 2 separate fasciculi above T?. Name the level and name the 2 fascicui |
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Term
| is/sacral, lumbar & lower 6 thoracic dorsal roots. |
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Definition
| The fasciculus gracilis is OR is not present at all spinal levels and contains long ascending branches of fibers from ? dorsal roots. |
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Term
| T6/ upper 6 thoracic and all cervical dorsal roots. |
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Definition
| The fasciculus cuneatus first appears around what spinal level and contains long ascending branches of fibers from ? dorsal roots. |
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Term
| fasciculus gracilis and cuneatus |
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Definition
| 1st order neurons of the DCML pathway originate in the dorsal root ganglion and send their central processes ascending in ? |
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Term
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Definition
| Fibers in the fasciculus gracilis and cuneatus ascend ipsilaterally or contralaterally and terminate on relay nuclei in the ?. |
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Term
| nucleus gracilis and nucleus cuneatus |
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Definition
| 1st order neurons of the DCML end where? |
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Term
| 2nd order/internal arcuate fibers |
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Definition
| Nucleus Gracilis and Nucleus Cuneatus give rise to ? order fibers in the DCML pathway which sweep ventromedially as ? fibers. |
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Term
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Definition
| Internal arcuate fibers do or do not decussate and form a compact fiber bundle located on each side of the ? known as the medial lemniscus. |
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Term
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Definition
| In the DCML pathway, the ? ascends through the contralateral half of the brain stem. |
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Term
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Definition
| In the DCML pathway, the medial lemniscus ascends through the ipsilateral or contralateral half of the brain stem. |
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Term
| Ventral posterolateral (VPL) nucleus of the Thalamus. |
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Definition
| The 2nd order neurons terminate where in the DCML pathway. |
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Term
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Definition
| The 3rd order neurons of the DCML pathway begin where? |
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Term
| postcentral gyrus/parietal |
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Definition
| The 3rd order neurons of the DCML pathway send fibers to the ? of the cerebral cortex which is in the ? lobe. |
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Term
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Definition
| Lesions involving ? columns diminish or abolish 2 point discrimination and kinesthetic sense. |
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Term
| 2 point discrimination and kinesthetic sense |
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Definition
| Lesions involving posterior columns diminish or abolish ? and ? |
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Term
| equilibrium, stance and gait/ataxia |
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Definition
| Loss of position sense in LEs greatly impairs ? and results in ? |
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Term
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Definition
| The ? pathway transmits Nondiscriminative touch, temperature and pain. |
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