Topic 19: Nervous System - Nervous System Pathways - Ascending Flashcards
1
Q
What is the ascending pathway (sensory)?
A
- conduct impulses from general sense receptors into brain
2
Q
What are the 3 successive neurons from receptor to cortex?
A
- first, second, third order
3
Q
What is the first order neuron?
A
- receptor to spinal cord (PNS)
4
Q
What is the second order neuron? (3)
A
- interneuron
- multipolar
- cell body in dorsal horn of spinal cord or medulla (CNS)
5
Q
What does the second order neuron do in the medulla?
A
decussates
6
Q
What is the 3rd order neuron? (3)
A
- interneuron
- multipolar
- cell body in thalamus
7
Q
Where does the 3rd order neuron send impulses to?
A
- postcentral gyrus (sensory cortex) CNS
8
Q
What do the axons of the first and second order neuron form?
A
- ascending spinal tracts
