On Motor Control
In order to understand the physiological nature of the motor capacity called dexterity, one must first understand how movements are controlled in the human body. This seemingly natural and simple thing--control of movements, or as it is addressed in physiology, motor coordination, when analyzed by precise scientific methods--appears to be a complex and large enterprise that requires collective, organized participation of many physiological mechanisms.
In essay 3, we will see the reasons for the long process of the evolution and complication of this system and will discover how and by what means this development proceeded. First, however, we would like to answer questions which naturally arise: What are the reasons for this complex organization? What makes control of our body movements complex?
Human movement apparatus, called the skeletal-articular-muscular system, has an unusually rich mobility. The main supporting structure of the body is the trunk with the neck, or, in essence, the vertebral column with its 25 intervertebral links and associated muscular apparatus. It is capable of various, nearly snakelike bends, twists, and winds. The human neck is far less impressive in its flexibility and mobility than are the necks of giraffes, ostriches, or swans, but it is not worse in providing accuracy and stability in shifts and turns of the