Cell body soma perikaryon

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Groups of free ribosomes and numerous stacks of ribosome studded rough endoplasmic reticulum RER surround the nucleus. The cell body contains the nucleus and various organelles and is the metabolic and trophic relating to nutrition center of the neuron.

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Membrane potential is the voltage difference across the cell membrane brought about by differences in extracellular and intracel-lular ionic distributions. The axon is a slender, armlike projection that can extend tens, hundreds, or even tens of thousands of times the diameter of the soma in length and typically conducts electrical impulses away from the neuron's cell body.

Consequently, the processes of fibrous astrocytes do not form sheets and do not tend to conform to the shape of the surrounding neurons or vascular elements. This division is based on morphological, ultrastructural, biochemical and functional criteria. By using this site, you agree to the Terms of Use and Privacy Policy. The process of transporting materials from the soma to the distal aspect of the axon anterograde axonal transport can be an important site of toxic action.

Slow anterograde transport involves movement of neuro-filaments and microtubules synthesized in the cell body to the terminals at a rate of 0.

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Neuro-filaments are most abundant in the axon. However, in some neurons, collateral branches arise from the axon near their cell body; these branches are called recurrent collaterals. Cell bodies of interplexiform cells, the function of which is yet to be entirely elucidated, are distributed amongst the amacrine cells, with their processes extending to both inner and outer plexiform layers.

The transition from the cell body to proximal dendrites is gradual, and the cytoplasmic architectures of proximal dendrites and the cell body are similar.

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Click on a glial cell to move to the related section. Handbook of Clinical Neurology It performs the bulk of protein synthesis for the neuron and contains the nucleus.

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The interior of the soma consists of cytoplasm, a gel within a microtrabecular lattice formed by the microtubules and associated proteins that make up the cytoskeleton. The Cell Membrane The cell plasma membrane Fig. Cell bodies of AH-type neurons in the myenteric plexus are flat, coin-like disks with multiple neurites exiting around the perimeter Figure The ependyma forming the ventricular lining do not connect to a basal laminabut rest directly upon underlying nervous tissue.


Each nerve cell neuron consists of a cell body peri-karyon or soma from which numerous processes neur-ites arise. The nucleolus synthesizes ribosomal RNA, which has a major role in protein synthesis. For example, thalamocortical axons display one major innervation zone, which defines the vertical and horizontal extents of the L4 barrel. The most characteristic feature of L2py neurons are short, tilted apical dendrites i.

Amacrine cells are located on the inner aspect of the inner nuclear layer and modify the signal input to the ganglion cells. The Golgi apparatus is also well developed and encircles the nucleus Marieb and Hoehn The axon hillock is a specialized domain of the neuronal cell body from which the axon originates.


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