primary motor cortex pyramidal cell L5 extratelencephalic projecting glutamatergic cortical neuron non-medulla, extratelencephalic-projecting glutamatergic neuron of the primary motor cortex An extratelencephalic-projecting glutamatergic neuron located in layer 5b of the primary motor cortex that does not project to the medulla. Non-MY ET cells are large, big-tufted cells with the apical dendrite often bifurcating close to the soma, suggesting they are corticospinal cells. Non-MY ET cells have bigger hyperpolarization sag, lower input resistance, and smaller AP width, compared to L5 IT neurons. non-MY ET glut MOp non-MY ET MOp (Mus) non-MY ET M1