Methods to observe the damage of blind sac and epithelium membrane system with the aid of histology and electron microscope.

The result is that in some cases, the dermoid sinus remains connected to the animal's spinal cord; in other cases, the sinus terminates in a "blind sac" that is less dangerous to remove.

Results a number of phagocytes induced by cadmium lead to the blocked blind sac, the damage degree of membrane system and connective tissue was increased with the increase of density of cadmium...