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What is a pathway?
Pathways: Groups of axons that perform a function within the brain.
Regions of spinal cord - Review
White Matter Pathways
-Posterior column (funiculus)
What is the pathway name & function?
Posterior Column Medial Lemniscus Pathway
Pathway name: Posterior Column Medial Lemniscus Pathway:
Function: Carries general sensation from skin.
1) Sensation from skin.
4) Post-central gyrus
Function. (from where to where)
From which part of the spinal cord to which part of the brain?
1) Carries pain from skin to spinal cord (primary afferents)
2) Relay to second order neurons.
3) Thalamus (3rd, tertiary order neurons)
(from T12 --> Thalamus --> Post-central gyrus)
*Pain/damage to the particular side causes paralyzation from that spinal nerve and down.
What is Proprioception?
(2) What part of the brain receives information from Proprioception?
1) Function: relay information called, Proprioception.
Proprioception: awareness of the parts of the body without having to look at them.
2) Brain parts: Pons --> Cerebellum (movement)
Corticospinal Pathway (pre-central gyrus)
What is the result of fiber damage?
Function: Motor neurons send info. to spinal cord to cause a voluntary movement.
85% (right, from medulla): crosses and distribute to the right side.
15% (left, medulla and below): travels down from where they originate.
*All fibers have affect on opposite side of spinal cord from where they originated.
Damage: paralysis to other side of body.
Damage to T7 (lateral funniculi on right side of spinal cord and anterior right)
What is the motor defiicit?
Where's the loss of pain?
85% down @ T7 and below, right side.
15% down @ T7 and below on left.
Loss of pain: @ T7 and below on left side.
Right side responsible for? (4)
Left side responsible for? (5)
Space and pattern perception
Mental images to compare social r'ships
Pathways and Integrative Functions