In the region of the thorax there are ten till twelve ganglia (ganglia thoracica); wich are white; triangle and irregular shape; rarely fusiform (spindle-shaped) or round. In the upper part of the thorax; ganglia are located in front of of the neck of ribs (collum costae); and in the middle part they are in front of head of ribs (caput costae). In the lower parts; they are near the vertebral bodies; therefore both of the trunks are slightly convergent. In this part; there are no branches which connected both sides of the sympathetic trunk. Lipofucin is yellow-brown; autofluorescent pigment; accumulated during aging in the lysosome of postmitotic cells; such as neurons.