Many thanks for the nice video lecture. If US measurements are reliable, with a larger pickup area (16-24 sq. mm.), concentric needle pick up area and hence the size of MU territory may be higher than 5-15 sq. mm reported by simulation studies (Nandedkar and others). In the images, diameter of the fasciculating area appears to extend to 2-3 cm. Earlier, Buchthal F et al, using multi-lead electrode recording had also reported a larger motor unit territory.
Many thanks for the nice video lecture.
If US measurements are reliable, with a larger pickup area (16-24 sq. mm.), concentric needle pick up area and hence the size of MU territory may be higher than 5-15 sq. mm reported by simulation studies (Nandedkar and others). In the images, diameter of the fasciculating area appears to extend to 2-3 cm. Earlier, Buchthal F et al, using multi-lead electrode recording had also reported a larger motor unit territory.
That sounds plausible, yes; thank you for pointing this out! I think there are even some MRI studies right now that show similar MU sizes.