31. For example, the motor cortex of the right brain controls movement of the contralateral left arm. 32. The VTh projects to upper motor neurons in the primary motor cortex ( precentral gyrus ). 33. The primary motor cortex contains cells with giant cell bodies known as " Betz cells ". 34. In their initial experiments, Graziano and colleagues used electrical microstimulation on the motor cortex of monkeys. 35. In 1870, they had published results on localized electrical stimulation of the motor cortex in dogs. 36. Through literature, they have found that primary motor cortex neurons may control skill acquisition and retention. 37. They found that this type of stimulation of the monkey motor cortex often evoked complex, meaningful actions. 38. Schwartz and colleagues showed that motor cortex neurons were well correlated with the speed of the hand. 39. One of the first detailed maps of the human motor cortex was described in 1905 by Campbell. 40. Spine clustering in the motor cortex reflects a morphological mechanism for synaptic storage of specific motor memories.
