S3: Anterolateral Pathway

Question 1

protopathic info comes into the spinal cord In ___ diamter dorsal root axons

Answer 1

small

Question 2

protopathic infor enters spinal cord and travels upwards in ___

Answer 2

Lissaeurs tract or the dorsolateral fascilulus

only goes up or down 2 spinal segments before SYNAPSING IN THE DORSAL HORN

Question 3

after synpasing in the dorsal horn, the second order neuron then ____

Answer 3

crosses in the spinal cord and ascends as the anterolateral tract

Question 4

after traveling up as the antero lateral tract what happens to the axons?

Answer 4

1. they synapse at every level in the brainstem, most synapsing in the reticular formation (these can then synapse in the same regions of the thalamus)
2. thalamus: vpl, dorsomedial, intralaminar etc

Question 5

from the thalamus, signals then go to the

Answer 5

post central gyrus via the internal capsule

also to more widespread areas related to pain perception and appreciation (anterior cingulate, frontal lobe).

Question 6

signals from the ALS get from the thalamus to the post central gyrus via the

Answer 6

internal cpasule

Question 7

contralteral loss of proppathic can be seen with X to

Answer 7

ALS -

1. anterolateral tract in spinal cord
2. ALS synapsing in the brainstem
3. VPL, DM, intalaminar in thalamus
4. post central gyrus

Question 8

loss of protopathic sx include

Answer 8

Reduced pain
Reduced sense of warming or cooling skin
Simple touch intact but reduced in sensitivity