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14 Cards in this Set

  • Front
  • Back
Which is likely to lose sensation first in syringomyelia, arms or hands?
Arms
(Syringomyelia is a cyst within the spinal cord and as such affects more medial structures first)
What are the characteristics of Brown-Sequard syndrome
Contralateral loss of pain and temperature (beginning one or two segments below hemisection)
Ipsilateral loss of touch and proprioception
Ipsilateral spastic paralysus
Which sensory modality uses the fastest axons?
Proprioception
Fibres from the dorsal columns after synapsing form the...
Medial Lemniscus
The last synapse of somatosensory tract fibres before the cerebral cortex occurs in...
Ventroposterior nucleus of the thalamus
Site where the dorsal column-medial lemniscus system crosses the midline...
medulla (via internal arcuate fibres)
Site where spinothalamic tract axons cross the midline...
Anterior white commisure
Where is the cortical area representing touch sensation?
Postcentral gyrus of parietal lobe
What are the properties of Pacinian Corpuscle?
Fast Adapting
Large Receptive Field
Detect Vibration
What are the properties of Ruffini's endings?
Slow Adapting
Large Receptive Field
What are the properties of Messner's corpuscle?
Fast Adapting
Small Receptive Field
What are the properties of Merkels Disk?
Slow adapting
Small Receptive Field
Through which pathway does touch and vibration travel in the spine?
Dorsal Column Medial Lemniscal Pathway
Where does the primary somatosensory cortex S1 receive inputs from?
Ventral Posterior Nucleus of Thalamus