motor neuron, leg motor neuron, T1 leg motor neuron, Azevedo Lesser Mark Phelps et al. 2022, left soma, L4 bundle, soma in T1, primary class, motor neuron, leg motor neuron, publication, soma side, T1 leg motor neuron, soma segment, left T1 leg nerve, L4_T1L, trochanter_extensor_in_coxa_Lg, T1_L_MN, trochanter_extensor_in_coxa_Lg, T1L, MN