The peripheral nervous system (PNS) covers the part of the nervous system, which is convenient outside of the brain and The latters form the nervous system (ZNS) for center. Contrary to this the PNS is not protected by bones or the blood-brain barrier. The PNS is further divided into the somatic nervous system and the autonomous nervous system.

The rigid demarcation of the PNS of the ZNS is however not meaningful from functional view. Nerve cells (Neurone) always consist of a (Soma) and its extensions. The motor (for the movement responsible person) and vegetative (for the function of the internal organs responsible) Neurone have all their Soma in the ZNS. The sensitive (for feelings responsible persons) Neurone has its Soma nearly without exception in nerve knot (ganglia) in the PNS, however nearly all extensions pull into the ZNS, where the actual data processing takes place and is released conscious or unconscious (reflex) reactions. The PNS existed therefore not as independent system, but is a purely topographically defined department. An exception of it makes only the intramurale nervous system (nerves in the wall of internal organs), with which the data processing takes place partially independently from the ZNS.

To the peripheral nervous system belong:

• Cranial nerves
• Spinalnerven (nerves from that back Marks)
• intramurales nervous system

including its receptors and effector organs (like e.g. motor end plates and ganglia).

Articles in category "Peripheral nervous system"

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