IMED3002 Lecture Notes - Lecture 9: Lateral Corticospinal Tract, Upper Motor Neuron, Corticobulbar Tract
28 May 2020
School
Department
Course
Professor
Document Summary
Corticospinal tract: most important: longest continuous white matter tract in the cns! motor cortex- to the anterior horn of spinal cord grey matter. If hamstrings to contract--- umn from primary motor cortex to the anterior horn of l5,s1,s2. 2nd nerve: out of the ventral horn and synapse onto the muscles of the group: more than 1 million myelinated axons descending down each side of the spinal cord. Concerned with the control of voluntary, discrete, skilled. Fractionated movements (esp. those of distal parts of limbs). 1st order (upper motor) neurons" cell bodies in the precentral gyrus of frontal lobe (primary motor cortex). Descend ipsilaterally through corona radiata and internal capsule to enter crus cerebri of midbrain: motor areas of the brain and homunculus: Entire cortex: mapped to certain parts of the body. Cell body in the anterior horn of the spinal cord grey matter: upper motor neuron:
