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.
This was one of the first theories proposed, with the theory first being published in the early 1960s. Why I listed the date on this one was that it failed to consider the cultural shift with old age.ame goes for people of any age. Often, the activity theory is dismissed to some degree because it falls a little flat. It isn't sufficient to just be busy, like the definition states. You can't wake up every day and do the same thing like riding a stationary bike, and expect to age well.