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Lateral hemi-section of spinal cord, LEG signalling??? onLY>???, THIS…
Lateral hemi-section of spinal cord
Tracts
Dorsal columns
Ascend ipsilaterally, ie ipsilateral effect (1 cuneate and 1 gracile fasciculi)
Fine touch, vibration and proprioception
Synapse in the medulla then Decussate
Ventral posterolateral nucleus of the Thalamus
Primary Somatosensory Cortex
Synapse is in the gracile/cuneate nucleus
Decussate to contralateral lemniscus
ipsilateral loss of
fine touch
Proprioception
Vibrations
Spinothalamic
1st order enter posterior horn (body in dorsal root)
Synapse in posterior horn ( 2nd order bodies in the grey matter)
Decussate at that level and enter the contralateral spinothalamic tract
Becomes the Spinal lemniscus in the midbrain
Synapse to third order in the thalamus and follow the internal capsule to the primary somatosensory cortex
Nociception: (Lissauer tract) 1st order neurones can go up or down a few levels in the spine
Nociception and pain localisation, temperature, crude touch, pressure
Contralateral loss of function
Spinocerebellar
Proprioception
First order neurones normal until they reach the cord
Loop into the dorsal column then back out into
Clarke's column
synapse in Clarke's column and head into ipsilateral Dorsal spinocerebellar tract
Pyramidal
Corticospinal
LEG signalling??? onLY>???
THIS BIT IS KINDOF WRONG DONT LOOK AT IT YET