Scwann cells
neuroglia that make up the myelin sheath in the PNS
Schwann cells are specialized cells that are found in the peripheral nervous system, where they play a critical role in supporting the nerves. These cells are a type of glial cell that form myelin sheaths, which are essential for the proper functioning of nerves.
The primary function of Schwann cells is to provide structural support and insulation to neurons. They wrap around axons, the long extensions of nerve cells, in a spiral fashion, forming a layer of myelin. This myelin sheath serves to protect and insulate the axon, increasing the speed of nerve impulses and preventing signals from crossing over to adjacent nerves.
Schwann cells also play a role in maintaining the health of neurons, providing nutrients and removing waste products. They are involved in the repair of damaged nerves, as they can aid in the regeneration of axons after injury. In addition, Schwann cells are involved in immune responses, helping to clear away debris and promote healing.
Overall, Schwann cells are an essential component of the nervous system, with numerous roles in supporting and protecting neurons. Dysfunction of Schwann cells can lead to a range of neurological disorders, including peripheral neuropathy and Guillain-Barre syndrome.
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