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TSM 6
Somatosensory Pathways
10
Medical
Undergraduate 2
11/09/2012

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Cards

Term
Name the 2 major ascending pathways
Definition
1. The dorsal column system (medial lemniscus)
2. The anterolateral system
Term
What is the role of the dorsal column system?
Definition
Fine touch, proprioception and vibration transmission
Term
What is the role of the ALS?
Definition
Pain, temperature, crude touch and pressure transmission
Term
Which pathway synapses with the reicular formation?
Definition
The ALS
Term
At what level does the ALS decussate?
Definition
The spinal cord
Term
At what level does the dorsal column system decussate?
Definition
The medulla
Term
What does the gracile fasciculus of the dorsal column sysem contain?
Definition
Afferents from the lower limb and lower trunk
Term
What does the cuneate fasciculus of the dorsal column sysem contain?
Definition
Afferents from the neck, upper trunk and upper limb
Term
What is the chief sensory nucleus responsible for?
Definition
Fine touch.
Term
What is the mesencephalic nucleus responsible for?
Definition
Proprioception.
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