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16 Cards in this Set
- Front
- Back
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Posterior (dorsal) spinocerebellar tract |
(lateral) Origin: proprioreceptors, dorsal Enters: Gracile fasciculus Synapse on: Clarke's nucleus Travels laterally carries proprioceptive information from the lower trunk and leg (ipsilateral) Fasciculus gracilis-->clarke's nucleus in T1-L2/3-(synapse)->cerebellar cortex |
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Cuneocerebellar tract |
Proprioreceptors Enters: Cuneate Fasciculus Synapse on: cuneate nucleus (lateral part)> Rostral medulla: inferior cerebellar peduncle Travels more rostrally carries proprioceptive information from the upper trunk and arm (ipsilateral) |
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Anterior (ventral) spinocerebellar tract |
Synapses immediately on: Lamina VI, spinal (gray) border cells whose axons cross over midline and ascend rostrally in lateral funiculus Travels up to rostral pons: axon join superior cerebellar peduncle, recross midline and enter cerebellum carries generalized proprioceptive and cutaneous information from the lower trunk and leg (information related to attempted movement) (contralateral) |
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What levels contains Clarke's nucleus? |
T1-L2/3 (Lamina VII) |
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pathway 1 |
dorsal root ganglia |
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pathway 2 |
sympathetic ganglia |
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pathway 3 |
enteric ganglia, andrenal medulla |
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pathway 4 |
melanocytes |
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Neural crest cells form the |
Dorsal root ganglion sympathetic ganglion Anterior part is available for migration |
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General pathway of the Spinocerebellar Tracts |
L4 (convention)-->T12-->C8-->Caudal medulla-->Rostral medulla-->Caudal pons--> Rostral pons (only the anterior spinocerebellar tract go to rostral pons) |
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General pathway of the Spinothalamic Tract |
Anterolateral Lumbar-->Cervical-->Caudal Medulla-->Rostral Pons-->Rostral Midbrain-->Postcentral gyrus PAIN & TEMPERATURE 2nd and 3rd level fibers |
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Dorsal Posterior Columns, Pathway |
Enter from dorsal root ganglion Caudal fibers in fasiculus gracilis Rostral fibers (above T6) in fasciculus cuneatus >caudal medulla: synapse in nucleus gracilis or nucleus cuneatus and CROSS MIDLINE&enter medial lemniscus (up/down-->side/side) >travel rostrally to thalamus, synapse in the ventral posterolateral nucleus>post central gyrus of cortex (somatosensory cortex) |
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Dorsal Posterior Columns, General Facts |
Three orders of fibers: primary sensory, nucleus cuneatus and nucleus gracilis, thalamus 3 synapses to get sensory information (tactile and proprioceptive) info from periphery (DRG) into the brain Info crosses to contra later side at medulla level |
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Spinothalamic Tract, General Facts |
Enter spinal cord through Lissauer's tract Synapse in substantia gelatinosa (Lamina II) 2nd and 3rd order fibers project across midline immediately Caudal medulla: collateral branch to reticular formation (synapse) Rostral midbrain: collateral branch (synapse) Synapse in ventral posterolateral of thalamus Thalamic neuron project to postcentral gyrus and insular cortex |
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Stays ipsilateral |
Cuneocerebellar tract Spinocerebellar tract |
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Crosses over midline, Contralateral side |
Anterior spinocerebellar tract: cross at spinal cord (immediate) Dorsal/Posterior Columns: caudal medulla (medial lemniscus) Spinothalamic: 2nd and 3rd order cross midline>anterolateral pathway (immediate) |
