Nissl bodies (Nissl substance)
Nissl bodies is a large granular body found in neurons. These
granules are of rough endoplasmic reticulum (RER) and free ribosomes. They are
the site of protein synthesis. The functions of Nissl bodies is thought to be
the same as that of the rest of the ER and the golgi apparatus: the manufacture
and release of proteins.
Astrocytes
Astrocytes are the most numerous and
diverse neuroglial cells in the CNS. The
functions of astroglial cells are many; astrocytes create the brain
environment, build up the micro-architecture of the brain parenchyma, maintain
brain homeostasis, store and distribute energy substrates, control the
development of neural cells, synaptogenesis and synaptic maintenance and
provide for brain defense.
Gray and
White matter
The CNS
has two kinds of tissue: grey matter and white matter, Grey matter, which has a
pinkish-grey color in the living brain, contains the cell bodies, dendrites and
axon terminals of neurons, so it is where all synapses are. White matter is
made of axons connecting different parts of grey matter to each other.
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