<unk> s in different brain regions are both functionally and anatomically diverse: the only thing they have in common is smallness. For instance, olfactory bulb<unk> s are GABAergic and axonless, while<unk> s in the dentate gyrus have glutamatergic projection axons. These two populations of<unk> s are also the only major neuronal populations that undergo adult neurogenesis, while cerebellar and cortical<unk> s do not.<unk> s (save for those of the olfactory bulb) have a structure typical of a neuron consisting of dendrites, a soma (cell body) and an axon. Dendrites: Each<unk>  has 3 – 4 stubby dendrites which end in a claw. Each of the dendrites are only about 15 μm in length. Soma:<unk> s all have a small soma diameter of approximately 10 μm. Axon: Each<unk>  sends a single axon onto the Purkinje cell dendritic tree. The axon has an extremely narrow diameter: ½ micrometre. Synapse: 100–300,000<unk>  axons synapse onto a single Purkinje cell. The existence of gap junctions between<unk> s allows multiple neurons to be coupled to one another allowing multiple cells to act in synchrony and to allow signalling functions necessary for<unk>  development to occur. Cerebellar<unk>  The<unk> s, produced by the rhombic lip, are found in the<unk>  layer of the cerebellar cortex. They are small and numerous. They are characterized by a very small soma and several short dendrites which terminate with claw-shaped endings. In the transmission electron microscope, these cells are characterized by a darkly stained nucleus surrounded by a thin rim of cytoplasm. The axon ascends into the molecular layer where it splits to form parallel fibers. Dentate gyrus<unk>  The principal cell type of the dentate gyrus is the<unk> . The dentate gyrus<unk>  has an elliptical cell body with a width of approximately 10 μm and a height of 18μm. The<unk>  has a characteristic cone-shaped tree of spiny apical dendrites. The dendrite branches project throughout the entire molecular layer and the furthest tips of the dendritic tree end just at the hippocampal fissure or at the ventricular surface. The<unk> s are tightly packed in the<unk> r cell layer of the dentate gyrus. Dorsal cochlear nucleus<unk>  The<unk> s in the dorsal cochlear nucleus are small neurons with two or three short dendrites that give rise to a few branches with expansions at the terminals. The dendrites are short with claw-like endings that form glomeruli to receive mossy fibers, similar to cerebellar<unk> s. Its axon projects to the molecular layer of the dorsal cochlear nucleus where it forms parallel fibers, also similar to cerebellar<unk> s. The dorsal cochlear<unk> s are small excitatory interneurons which are developmentally related and thus resemble the cerebellar<unk> . Olfactory bulb<unk>  The main intrinsic<unk>  in the vertebrate olfactory bulb lacks an axon (as does the accessory neuron). Each cell gives rise to short central dendrites and a single long apical dendrite that expands into the<unk>  layer and enters the mitral cell body layer. The dendrite branches terminate within the outer plexiform layer among the dendrites in the olfactory tract. In the mammalian olfactory bulb,<unk> s can process both synaptic input and output due to the presence of large spines.
Granule cell
Foam cell
Nurse cell
Aschoff cell
Navicular cell
Respirocyte
Sustentacular cell
Corneocyte