人神经细胞HN

The tissue of the central nervous system is made up of two classes of cells that may be broadly categorized as neurons and glia. Neurons are anatomic, functional, and trophic units of the brain [1]. Despite great variability in size and shape, all neurons share common morphological features, which are those of the key elements of a highly complex communication network. The neurons are the dynamically polarized cells that serve as the major signa领 unit of the nervous system. The human brain is known to contain about 1 x 10^11 neurons, each being able to contact at least 10,000 other neurons [2].