1. Atrophy of Betz cells and corticospinal tracts constitute a second lesion. 2. The Betz cells are rare or absent in the adjacent cortex. 3. The Betz cells account for only a small percentage of the corticospinal tract. 4. The primary motor cortex contains cells with giant cell bodies known as " Betz cells ". 5. This region of cortex, characterized by the presence of Betz cells , was termed area 4 by Brodmann. 6. Even when the Betz cells are damaged, the cortex can still communicate to subcortical motor structures and control movement. 7. The location of the primary motor cortex is most obvious on histological examination due to the presence of the distinctive Betz cells . 8. Layer V of the primary motor cortex contains giant ( 70-100 �m ) pyramidal neurons which are the Betz cells . 9. The " Betz cells "'along with their long axons are referred to as the upper motor neuron ( UMN ). 10. The corticospinal tract also contains Betz cells ( the largest pyramidal cells ), which are not found in any other region of the body.
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