ANAT 321 Lecture 25: Motor Systems III
14 Nov 2016
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Lots of local connections between neurons that are coactivated: also part of the developmental process. So instead of clear boundaries, there are gradual transitions. Their paper proposes a hypothesis, and has models to back up their hypothesis. The remainder comes largely from premotor cortex, sma and s1: they are all directly involved in movement, multiple parallel pathways. The reason why the primary motor cortex is called so is because it required less intense electrical stimuli to excite the neurons, and stimulation resulted in twitches and jerks: mainly simple movements. In contrast, the premotor and supplemental cortices required higher intensity stimulation: when sufficiently stimulated, it would result in much more complex movements. The map of the body in motor cortex is complex, with fractures as well as multiple and overlapping representations of body parts. There are multiple different body maps - 3 different representations of the hand, for example.
