The origin of the fibers for the lateral corticospinal tract shows 1/3 premotor, 1/3 motor, and 1/3 sensory cortex. Does this also apply to the ventral tract?
As indicated in the notes, the ventral tract originates from premotor and motor. The precise ratio is not important. Question. Regarding the columnar organization of cells that influence a particular muscle, I don’t really understand how 1 “motor cell” in the cortex can be distributed to many cells (top figure, p.5), when I thought that each muscle has 1 dedicated cell in each column (thus stipulating that each motor cell affects only 1 lower motor neuron path – direct to that 1 muscle). Answer: The axon divides and each branch makes contact with several spinal motor neurons (as is shown in the diagram).
