How muscle spindles distribute it inside muscles? Can we detect the cell of muscle spindle using MRI scans? The orientation is it the same as muscle fibre pennate? Within the same muscle spindle, can we find two successive cells? The reaction of the muscle due to a spindle sensory stimulation is it limited to the adjoined fibres? I know about the allometric analysis method which used to identify the analogy between the number of muscle spindles and the masses of the muscles but I didn't find research about an analogy with the cross-section area.