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.
Schwann cell in Medicine Expand. Schwann cell (shwÃ¤n, shvÃ¤n) n. Any of the cells that cover the nerve fibers in the peripheral nervous system and form the myelin sheath. Also called neurilemma cell. Schwann cell. Any of the cells that cover the axons in the peripheral nervous system and form the myelin sheath. See more at myelin.