When one plate is composed of oceanic lithosphere and the other is composed of continental lithosphere, the denser oceanic plate is subducted, often forming an orogenic belt and associated mountain range. This type of convergent boundary is similar to the Andes or the Cascade Range in North America.hen one plate is composed of oceanic lithosphere and the other is composed of continental lithosphere, the denser oceanic plate is subducted, often forming an orogenic belt and associated mountain range. This type of convergent boundary is similar to the Andes or the Cascade Range in North America.
Myelinating Schwann cells wrap around axons of motor and sensory neurons to form the myelin sheath. The Schwann cell promoter is present in the downstream region of the human dystrophin gene that gives shortened transcript that are again synthesized in a tissue specific manner.
Again, when Schwann cells simply surround axons without forming myelin, these axons are called nonmyelinated (unmyelinated) axons or nonmyelinated nerve fibers. Axons surrounded by a myelin sheath are called myelinated axons or myelinated nerve fibers.eripheral nerves are bundles of nerve fibers that conduct impulses either from (efferent or motor) or into (afferent or sensory) the CNS. A nerve fiber by definition includes the neuronal process, either motor axon or sensory dendrite, plus the surrounding Schwann cell, be it myelinating or nonmyelinating.