BIOS1171 Lecture Notes - Lecture 21: Hemiparesis, Motor Unit, Cranial Nerve Nucleus
22 Aug 2018
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Document Summary
Corticospinal tract major source of projections to the cst: afferent projections from the premotor cortex [pmc] & supplementary motor area [sma] provide input to m1, predominantly ipsilateral projections. 2: movements are coordinated by m1 & ba 6. Pyramidal system: descending pathway from motor cortex, 2 neuron system: umn & lmn, corticospinal & corticobulbar tracts. Involved in organizing & planning sequence of muscle activation required to make movement (important in sequencing movements) Premotor cortex: somatotopic representation of complete body musculature, receives input from sensory areas of parietal cortex, projects to m1 & spinal cord, input to premotor cortex differs to the input to m1. Involved in the control of proximal limb used to position arm for movement tasks. Posterior parietal cortex: ba 5 & ba 7, carries out background computation (put all information of stimulus together to go to different areas of the cortex) 4: ba 5: receives input from somatosensory.
