Human respiratory movement electric model

1.This electric model of human respiratory movement can demonstrate the physiological mechanism in the process of human respiratory movement. The left side of the model briefly shows the relationship between sympathetic nerve and spinal nerve and the position and three directions of sympathetic prenodal fibers. On the right is the main part, which clearly shows the distribution of sympathetic and parasympathetic nerves. 
2.Size: 44*22*72 cm