An extratelencephalic-projecting glutamatergic neuron located in layer 5b of the primary motor cortex that projects to the medulla. MY ET cells are large, big-tufted cells with the apical dendrite often bifurcating close to the soma, suggesting they are corticospinal cells. MY ET cells have bigger hyperpolarization sag, lower input resistance, and smaller AP width, compared to L5 IT neurons. [ http://dx.doi.org/10.1101/2020.10.19.343129 http://www.ncbi.nlm.nih.gov/pubmed/24137110 http://www.ncbi.nlm.nih.gov/pubmed/9236245 ]