Corticospinal Tract

Corticospinal Tract - Somatosensory Corticospinal Tract *...

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Somatosensory Corticospinal Tract * 80 - 90 % of corticospinal tract axons cross to the other side in the distal medulla forming the lateral corticospinal tract. * The pyramidal decussation separates the medulla,above, from the spinal cord, below. * The Ventral Corticospinal tract contains the axons from the 10-20% of neurons whose axons did not cross to the other side at the pyramidal decussation. * The upper motor neuron axons then synapse on lower motor neurons in the Anterior horn of the spinal cord. * The axons of these lower motor neurons then exit the spinal cord via the Ventral root. Damage to LMN's causes flaccid paralysis. Postural Pathway Damage * Understand that the postural pathways are controlled to some degree by the cortical structures * You must be able to turn off selective postural systems to accomplish other movements. * Decorticate posture - cortical input is damaged close to its source, (i.e., in the internal capsule) * Since they are getting no input from cortex, the postural pathways
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Corticospinal Tract - Somatosensory Corticospinal Tract *...

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