1.It shows that the lower central nervous system, sympathetic nerve, parasympathetic preganglionic and postganglionic fibers. The left side of the model shows the relationship between the sympathetic nerve and the spinal nerve and the position and three directions of the prenodal fibers of the sympathetic nerve, and the main part is on the right, which clearly shows the distribution of the structural characteristics of the sympathetic nerve and parasympathetic nerve. 
2.Size: 59*24*83 cm