neuron cell bodies found in clusters in the cns are called golgi apparatus.
neuron cell bodies found in clusters in the cns are called?
golgi apparatus
the cell bodies for the facial nerve are grouped in anatomical areas called nuclei or ganglia. the cell bodies for the afferent nerves are found in the geniculate ganglion for taste sensation. the cell bodies for muscular efferent nerves are found in the facial motor nucleus whereas the cell bodies for the parasympathetic efferent nerves are found in the superior salivatory nucleus.









































section::::structure.:development.
facial nerve
the cns consists of neurons, astrocytes, and oligodendrocytes that are generated from multipotent stem cells. ncrp report no. 153 provides the following excellent and short introduction to the composition and cell types of interest for radiation studies of the cns: “the cns consists of neurons differing markedly in size and number per unit area. there are several nuclei or centers that consist of closely packed neuron cell bodies (e.g., the respiratory and cardiac centers in the floor of the fourth ventricle). in the cerebral cortex the large neuron cell bodies, such as betz cells, are separated by a considerable distance. of additional importance are the neuroglia which are the supporting cells and consist of astrocytes, oligodendroglia, and microglia. these cells permeate and support the nervous tissue of the cns, binding it together like a scaffold that also supports the vasculature. the most numerous of the neuroglia are type i astrocytes, which make up about half the brain, greatly outnumbering the neurons. neuroglia retain the capability of cell division in contrast to neurons and, therefore, the responses to radiation differ between the cell types. a third type of tissue in the brain is the vasculature which exhibits a comparable vulnerability for radiation damage to that found elsewhere in the body. radiation-induced damage to oligodendrocytes and endothelial cells of the vasculature accounts for major aspects of the pathogenesis of brain damage that can occur after high doses of low-let radiation.” based on studies with low-let radiation, the cns is considered a radioresistant tissue. for example: in radiotherapy, early brain complications in adults usually do not develop if daily fractions of 2 gy or less are administered with a total dose of up to 50 gy. the tolerance dose in the cns, as with other tissues, depends on the volume and the specific anatomical location in the human brain that is irradiated.
central nervous system effects from radiation exposure during spaceflight