NA 3

Question 1

Where do nerves enter the spinal cord for the dorsal column path?

Answer 1

Enter into posterior column via dorsal ganglion. Fibers above T6 are in the fasiculus cuneatus, below t6 in the fasiculus gracilus

Question 2

Where does the dorsal column pathway decussate?

Answer 2

At the medial lemniscus in the medulla (this becomes very midline as you ascend through medulla)

Question 3

What is the path of the dorsal column system from the medulla?

Answer 3

Medulla- medial lemniscus
Pons- orientation flips to medial lateral
Midbrain
Thalamus- synapse
Third order neurons project to primary somatosensory cortex

Question 4

Function to dorsal column/ medial lemniscal system

Answer 4

Vibration

Proprioception

Question 5

Role of spinothalamic tract

Answer 5

Pain, temperature, ascending from skin

Question 6

Where does the spinal thalamic tract decussate?

Answer 6

At entering cord level (posterior horn) and thalamus