<unk> s make up the functional tissue of the<unk> . The rest of the<unk>  tissue is structural or connective called the stroma which includes blood vessels. The two main types of<unk> s in the<unk>  are neurons, also known as nerve<unk> s, and glial<unk> s also known as neuroglia. Neurons are the excitable<unk> s of the<unk>  that function by communicating with other neurons and interneurons (via synapses), in neural circuits and larger<unk>  networks. The two main neuronal classes in the cerebral cortex are excitatory projection neurons, and inhibitory interneurons; around 70-80 per cent are neurons, and 20-30 per cent inhibitory interneurons. Neurons are often grouped into a cluster known as a nucleus where they usually have roughly similar connections and functions. Nuclei are connected to other nuclei by tracts of white matter. Glia are the supporting<unk> s of the neurons and have many functions not all of which are clearly understood, but include providing support and nutrients to the neurons. Glia are grouped into macroglia of astrocytes, ependymal<unk> s, and oligodendrocytes, and much small microglia. Astrocytes are seen to be capable of communication with neurons involving a signalling process similar to neurotransmission called gliotransmission.
Brain cell
Blood cell
Stem cell
Nurse cell
Complex cell
Hepatocyte
Granule cell
Lymphoblast