W19/L8 Flashcards
Where do the cell bodies of mechanosensory fibres live?
In the dorsal root ganglion
Where do the cell bodies of the pain & temperature sensory fibres live?
In the dorsal root ganglion
What is the topical arrangement of the dorsal columns?
Information from lower down in the body travels more midline
How many neurons are involved in mechanosensation?
3
What are the fibres for mechanosensation that decussate called?
Internal arcuate fibres
What are the two tracts in the dorsal column?
Gracile
Cuneate
What is carried in the gracile tract?
Primary mechanosensory neurones from the lower body
What is carried in the cuneate tract?
Primary mechanosensory neurone from the upper body
At what level do the mechanosensory neurons decussate?
The caudal medulla
After decussation, in what structure to the mechanosensory neurons travel in?
The medial lemniscus
At what point do the neurons of the medial lemniscus synapse with the ones that project to the cerebral cortex?
In the ventral posterior lateral nucleus of thelamus
