Definition of Schwann cell. : a myelin-secreting glial cell that spirally wraps around an axon of the peripheral nervous system to form the myelin sheath.
Considering this, what are Schwann cells and what do they do?
Schwann cells are a variety of glial cells that keep peripheral nerve fibres (both myelinated and unmyelinated) alive. In myelinated axons, Schwann cells form the myelin sheath.
Also, what is the difference between Schwann cells and myelin sheath? Schwann cells in the PNS form individual myelin sheaths (blue) around axons (orange), whereas oligodendrocytes in the CNS form multiple myelin sheaths (purple), each on separate axons. Schwann cell nuclei are located on the outside of the sheath.
Accordingly, what would happen if there were no Schwann cells?
This process causes the insulating myelin of axon segments to be lost, and conduction of nerve impulses down the axon is blocked. Schwann cells may suffer immune or toxic attack, as in Guillain-Barré syndrome and diphtheria. This also leads to a blockage of electrical conduction.
Where are Schwann cells found?
Schwann cells and satellite glia are the two main glial cell types of the peripheral nervous system (PNS). Whereas satellite glia are found within ganglia in close association with neuronal somata, Schwann cells are found in close contact with axons in the peripheral nerves.