Mena. Mena was founded in 1896 as a railroad town at the eastern foot of Arkansas's second highest peak, Rich Mountain (elev. 2,681).It is the eastern terminus of the Talimena Scenic Drive, a 54-mile byway that travels the crests of Rich and Winding Stair mountains between Mena and Talihina, Oklahoma.he byway and park provide impressive vistas of the Ouachita Mountains. The Mena Depot Center, located in a restored 1920 railroad depot, greets the town's visitors with tourism information, art and local history exhibits and railroad memorabilia. In Janssen Park, stands an 1851 log cabin still on its original site.
Structure [edit]. Schwann cells are a variety of glial cell that keep peripheral nerve fibres (both myelinated and unmyelinated) alive. In myelinated axons, Schwann cells form the myelin sheath (see above). The sheath is not continuous.Individual myelinating Schwann cells cover about 100 micrometres of an axonâequating to approximately 10,000 Schwann cells along a 1 metre length of the axon.n this sense, Schwann cells are the peripheral nervous system's analogues of the central nervous system 's oligodendrocytes. However, unlike oligodendrocytes, each myelinating Schwann cell provides insulation to only one axon (see image).
According to âNeurocytology: Fine Structure of Neurons, Nerve Processes, and Neuroglial Cellsâ, schwann cells, or neurolemnocytes, are located in the peripheral nervous system (PNS). They play a supporting role in the nervous system by wrapping around nerve tissue and cells to form a protective myelin sheath (which is comprised of 80 percent lipid and approximately 20 percent protein).