1 Ganglia-groups of neuron cell bodies that lie peripheral to the central nervous system in vertebrates. 2  Bipolar neurons-cell body located near the middle of the axon; characteristic of retinal neurons. 3  Unipolar neurons-cell body lies off to one side of axon; characteristic of sensory neurons.
The principal host for diamonds are rocks formed in the earth's mantle that are known as eclogite and peridotite that are carried to the earth's surface in magmas known as kimberlit e and lamproite.
Unlike other gems which are formed by a combination of elements, diamonds are made up of one single element-Carbon. Carbon-containing minerals present in the Earth at those depths, crystallize to form diamonds because of the immense pressure together with the heat from molten magma.