5/17/2023 0 Comments Somatic nervous system location![]() ![]() Several nerve fibers, plus their endoneurium, associate to form small fascicles surrounded by connective tissue referred as perineurium. Each nerve fiber, either myelinic and amyelinic, are surrounded by a thin layer of connective tissue known as endoneurium. Myelinic fibers are the most frequent in the peripheral nervous system. ![]() A myelinic fiber is an axon wrapped with several layers of one Shwann cell, whereas when a Schwann cell surrounds several axons at the same time, those axons are referred as amylinic (they usually show small diameters). Axons are wrapped by Schwann cell expansions and connective tissue. Nerves are axon bundles plus connective tissue. The somatic part is related to the control of voluntary movements of skeletal striated muscle, whereas the autonomic part is related to the involuntary movement of internal organs through smooth muscles. The main role of the peripheral nervous system is to convey the input information, or stimuli, that the body is able to sense (external, internal and proprioceptive inputs) to the central nervous system, and in turn, carries the commands of the central nervous system to the different organs and parts of the body.Ĭomponents of the peripheral nervous system.įrom a functional point of view, the peripheral nervous system can be divided in a somatic part and an autonomic part. The peripheral nervous system is composed of neurons and neuronal processes found outside the central nervous system (encephalon and spinal cord), as well as of glial cells, both Schwann glial cells that wrap the axons and peripheral glia located in the neuronal ganglia. Respiratory Quizzes Glossary Bibliography Central - Spinal cord - Rhombencephalon - Mesencephalon - Diencephalon - Hypothalamus - Subpallium - Pallium 2.2. ![]()
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