Ascending Tract Flashcards
Location of meissner corpuscle
Concentrated on finger tips
- A-beta fiber—> fast conducing
- discriminative touch
Merkel Nerve
- Discriminative Touch
- Fine detail
- A-beta fiber
Medial Lemniscal Pathway
- two point discrimination
- conscience proprioception
- vibratory sense
- -a-beta fiber
- decussations in medulla
- relays in lateral thalamus
- terminates in postcentral gyrus
Pacinian Corpuscle
Concentrated in fingers and in palm
- A-beta –> fast conducing
- bag of jelly surrounding nerve ending
Free nerve ending
- Anterolateral system
- Pain/ crude touch/ temperature
What funiculi contains the ascending tracts
Lateral, anterior, posterior = all 3
Fasiculus Gracilis
collects fibers caudal to T6
Fasiculus Cuneatus
collects fibers rostral to T6
In what fashion are fibers added
Added medial to lateral
At what level does the medial lemniscus system cross over?
Caudal medulla
Consequence of damage to dorsal column
loss of proprioception & discriminative tactile function
What is ataxia?
uncoordinated movements
What does the spinothalamic tract/ anterolateral pathway convey
pain and temperature
-awareness and localization of painful stimuli
At what level does the spinothalamic tracte cross
in the spinal cord
At what level does the spinothalamic tract meet up with the medial lemniscus
pons
