Each neuron consists of a cell body or perikaryon, from which arise the nerve fibers. And each neuron has two kinds of fibers: a single axon, which conveys nerve impulses away from the cell body, and one or more dendrites, which convey nerve impulses towards the cell body. Neurons are functionally linked by their fibers at connections called synapses. All neurons are post-mitotic.
However, unbalanced vegetarian diets may be lacking in a number of important nutrients. To ensure that you are eating a balanced vegetarian diet, you should regularly consume sources of vitamin B-12, iron, zinc, omega-3 fatty acids and essential amino acids.
With the exception of vitamin B 12 a vegan diet can in principle provide all necessary nutrients. However, in practice, vegans are frequently deficient in calcium , iron , vitamin D , selenium , phosphorous , and zinc . Vitamin B 12 presents a special issue. This vitamin is not provided to any meaningful extent by non-plant foods. (The algae spirulina contains B 12 , but in a non-absorbable form.) Deficiency in B 12 is therefore inevitable among those who follow a strict vegan diet and do not take supplements.