Chris Johnson - L5

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  • Created by: Rscottqub
  • Created on: 29-03-19 16:24
Somatosensory
part of the sensory NS responsible for touch, pressure, temperature,pain, joint position
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1st order neurones
have receptors at nerve endings, bodies are located in the DRG, enter spinal cord via dorsal roots
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2nd order neurones
synapse with 1st order, travel to brain via ascending tracts
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ascending tracts
connect 2nd order neurones to 3rd order . 3rd order then transmit to sensory cortex
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4 types of neurone
Aa, AB, Asigma, C
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Aa
muscle spindle, GTO , touch and pressure
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AB
touch, pressure , vibration
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Asigma
touch pressure, pain, temp
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C
pain and temp
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what type of information does the spinothalamic tract deliver
TEMP, PAIN, PRESSURE
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Whate type of information does the dorsal column deliver
fine touch and vibration
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transmittance via which tract involves crossing over in the spine ?
spinothalamic tract
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where does the dorsal collumn route cross the midline?
after leaving the dorsal column nuclei to travel to the thalmus
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the more sensitive an organ...
the more area dedicated to this region in the somatosensory cortex
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Dermatone
area of the skin sensation associated with a particular spinal level
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Somatosensory defects (2)
peripheral lesions. brain/spine lesions
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peripheral lesions
localised symptoms ie. stomach cramps
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brain/spinal lesions
wide spread symptoms
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defects of the primary sensory neurones can be due to
trauma, nerve root damage, neuropathy- alcohol, chemo etc.
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what can defects of primary sensory/1st order neurones lead to
numbness/pins and needles
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defects of ascending tracts - ie dorsal /spinothalamic
bilateral, unilateral, temp + pain loss
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bilateral
sensory loss in all modalities below level of lesion
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unilateral
joint position loss on the SAME side as lesion
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temp and pain loss
on the opposite side to lesion
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modalities
light, sound,taste,temp,smell, pressure
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Damage within brain
causes loss from opp side of body
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Other cards in this set

Card 2

Front

1st order neurones

Back

have receptors at nerve endings, bodies are located in the DRG, enter spinal cord via dorsal roots

Card 3

Front

2nd order neurones

Back

Preview of the front of card 3

Card 4

Front

ascending tracts

Back

Preview of the front of card 4

Card 5

Front

4 types of neurone

Back

Preview of the front of card 5
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