Table 2. Measurable indices of motoneuron (MN) and muscle unit (mU) sizes in mammals.

$S_{MN}$ and $S_{mU}$ are conceptual parameters which are adequately described by the measurable and linearly inter-related quantities reported in this table.

MN size (SMN)	mU size (SmU)
${\displaystyle S_{neuron}}$	${\displaystyle F^{tet}}$
${\displaystyle D_{soma}}$	${\displaystyle IR}$
	${\displaystyle CS{A}^{mean}}$
	${\displaystyle CS{A}^{tot}}$