Whose name is used for the protective layer around nerve fibers that speeds up signals in mammals?

Theodor Schwann, a 19th-century German physiologist, is remembered for foundational work in cell theory and nerve tissue. In the peripheral nervous system, Schwann cells wrap nerve fibers and form the myelin sheath, which speeds electrical conduction. This insulation is crucial for fast communication between the brain, spinal cord, and the rest of the body. Schwann’s work helped establish the cellular basis of animal tissue and remains central to neuroscience and anatomy.