Ascending Tracts Flashcards
What is an ascending pathway?
The route by which the sensory nerves move from the receptor to the cortex
Which part of the cortex do the ascending tracts target?
Post-central gyrus- primary sensory cortex in parietal lobe
Where can the 1st order neurone of an ascending tract by found?
Dermatome
Where can the 2nd order neurone of an ascending tract be found?
Spinal grey
Where can the 3rd order neurone of an ascending tract be found?
Thalamus
Which modalities travel in neurones found in the medial-lemiscus pathway?
Fine touch
Vibration
Proprioception
2-point discrimination
Where do neurones in the medial-lemiscus pathway dessicate?
Medulla
What is the name of the nucleus where sensory neurones from T5 and above, in the medial-lemiscus pathway synapse?
Cuneate nucleus
What is the name of the nucleus where sensory neurones from T5 and below, in the medial-lemiscus pathway synapse?
Gracile nucleus
In the medial-lemiscus pathway, which nerves are the most lateral?
Cranial nerves
Which modalities are carried in the spinothalamic pathway?
Pain
Crude touch
Temperature
Where do neurones in the spinothalamic tract dessucate?
At their spinal level
Which nerves are the most lateral in the spinothalamic pathway?
Sacral nerves
What modality is carried in the spinocerebellar pathway?
Unconscious proprioception
How do the neurones in the spinocerebellar pathway differ to the neurones in other ascending tracts?
Only has 2 cell bodies- 2nd order neurone enters cerebellum and synapses directly on the brain
