The human brain consists of two main types of cells, one is neurons that perceive changes in the environment and then transmit information to other neurons. The structure consists of two parts: the cell body and the neurons. There are two types of neurons: dendrites and axons. Dendrites, which are mostly dendritic, receive stimuli and transmit impulses to the cell body; axons, which are cord-like, transmit impulses from the cell body to the terminal. The other type is the glial cell, whose role is mainly to provide support, supply nutrition, maintain environmental constancy, provide insulation, and participate in the transmission of messages. In the human brain, the ratio of glial cells to neurons is estimated to be about 10:1. As an easy to understand example, the complex network of the human brain is similar to our railroad transportation network, in which neurons are the city, neurosynapses are the railroad tracks linking the city, and glia are the protective facilities around the tracks. Tumors of glial cell origin are called gliomas. They are classified according to the type of cells from which they originate: astrocytoma, oligodendroglioma, ventricular meningioma, microglia, etc. In some cases, glial cells begin to proliferate abnormally and form clusters (gliomas) that invade the surrounding normal brain tissue, compressing or destroying the surrounding brain tissue and causing symptoms, which can be detected by imaging, or by physical examination before causing obvious symptoms.