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Spinal tracts

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fixululu's version from 2017-10-31 17:44

Section

Question Answer
Dorsal column Ascending, synpase in the nucleus cuneatus and gracilis, cross at the medial lemniscus and synapse in the VPL and to the somatosensory cortex
Dorsal column function FINE TOUCH, VIBRATION, PROPRIOCEPTION
Spinothalamic tract featuresFirst prder neurons synapse in the grey matter of the spinal cord and cross the ventral white commisure, then travel up the spinal cord to form the spinothalamic tract through the medulla, through the pons to form the spinal lemniscus and synapse in the VPL to go to the somatosensory cortex
Spinothalamic tract functionPAIN, TEMP, CRUDE TOUCH, PRESSURE
Spinothalamic tract problems Cut above L3 then everything above L3 would be fine whereas below L3 there would be inability to feel pain, temp touch and pressure on the contralateral side
Corticospinal tract features From the motor cortex down the internal capsule to the midbrain, through the crus cerebri, down through the pons to the medulla where the fibres decussate at the level of the pyramids and synapse with upper or lower motor neurons
Corticospinal tract special features Lateral and ventral portions
Corticospinal tract lesions Lesion causes loss of function below the level it has been applied
Difference between spinothalamic and dorsal and corticospinal Lesion in spinal cord in spinothalamic means loss of function on contralateral side
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