1 Rheumatoid arthritis (RA), an autoimmune disease that can cause pain in the joints. 2  RA occurs when the immune system attacks the joints and muscles causing joint pain and stiffness. 3  Lupus, an autoimmune disease like RA, that causes inflammation in the joints, as well as in the tendons, skin and other connective tissues. Lupus, an autoimmune disease like RA, that causes inflammation in the joints, as well as in the tendons, skin and other connective tissues. 2  Gout, which occurs when uric acid crystals build up in the joints, and causes joint inflammation, pain and tenderness.
Although the ANS is also known as the visceral nervous system the ANS is only connected with the motor side. Most autonomous functions are involuntary but they can often work in conjunction with the somatic nervous system which provides voluntary control.
Figure 1a: Principal cortical domains of the motor system. The primary motor cortex (M1) lies along the precentral gyrus, and generates the signals that control the execution of movement. Secondary motor areas are involved in motor planning. The plane of section is elaborated in figure 1b.