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All cells come from preexisting, living cells.The Neuron doctrine postulates several elementary aspects of neurons.

The brain is made up of individual cells (neurons) that contain specialized features such as dendrites, a cell body, and an axon.

Neurons are cells differentiable from other tissues in the body.

Neurons differ in size, shape, and structure according to their location or functional specialization.

Every neuron has a nucleus, which is the trophic center of the cell (The part which must have access to nutrition).If the cell is divided, only the portion containing the nucleus will survive. Nerve fibers are the result of cell processes and the outgrowths of nerve cells.(Several axons are bound together to form one nerve fibril. Several nerve fibrils then form one large nerve fiber. Myelin, an electrical insulator, forms around selected axons. Neurons are generated by cell division.Neurons are connected by sites of contact and not via cytoplasmic continuity.