Corticobulbar tract. And that includes these upper motor neuron axons that are going to innervate lower motor neurons in the brain stem and because the wiring is a little bit more complicated in the brain stem, we can get some different patterns of weakness with abnormalities of this pathway.
Activity theory (AT; Russian: ÑÐµÐ¾ÑÐ¸Ñ Ð´ÐµÑÑÐµÐ»ÑÐ½Ð¾ÑÑÐ¸) is an umbrella term for a line of eclectic social sciences theories and research with its roots in the Soviet psychological activity theory pioneered by Lev Vygotsky, Alexei Leont'ev and Sergei Rubinstein.
The second major line of development within activity theory involves Russian scientists, such as P. K. Anokhin and N. A. Bernshtein, more directly concerned with the neurophysiological basis of activity; its foundation is associated with the Soviet philosopher of psychology S. L. Rubinshtein.ctivity theory is most often used to describe actions in a socio-technical system through six related elements (Bryant et al. as defined by Leonti'ev 1981 and redefined in Engestroem engestrÃ¶m) 1987 of a conceptual system expanded by more nuanced: 1  Theories-object-orientedness the objective of the activity.  system