The cells which form the myelin sheath around a nerve fibre.
Cells that lay down the myelin sheath around the axon of certain nerve fibers.
A structure of the peripheral nervous system that forms the myelin sheath and neurilemma of a nerve fiber.
The cells that lay down the myelin sheath around the axon of a medullated nerve fiber. Each cell is responsible for one length of axon, around which it twists as it grows, so that concentric layers of membrane envelop the axon. The gap between adjacent Schwann cells forms a node of Ranvier.
Pain felt down the back and outer side of the thigh, leg, and foot. It is usually caused by degeneration of an intervertebral disk, which protrudes laterally to compress a lower lumbar or an upper sacral spinal nerve root. The onset may be sudden, brought on by an awkward lifting or twisting movement. The back is stiff and painful. There may be numbness and weakness in the leg. Bed rest will often relieve the pain but any persistence of numbness or weakness is an indication for surgical treatment.
The cells that produce the myelin sheath of the axon of a medullated nerve. They are wrapped around a segment of the axon, forming concentric layers.
One of the cells of the peripheral nervous system that form the myelin sheath and neurilemma of peripheral nerve fibers. In the embryo, the Schwann cells grow around the nerve fiber, forming concentric layers of cell membrane (the myelin sheath). The cytoplasm and nuclei of the Schwann cells, external to the myelin sheath, form the neurilemma.