Medicogramover 1 year ago

Myelinated nerves

Coloured scanning electron micrograph (SEM) of a section through myelinated nerve fibres and Schwann cells. Myelin (green) is an insulating fatty layer that surrounds the nerve fibre (axon, black), increasing the speed at which nerve impulses travel. It is formed when Schwann cells (grey) wrap around the fibre, depositing layers of myelin between each coil. The outermost layer consists of the Schwann cell's cytoplasm and is known as the neurolemma or sheath of Schwann. This image shows how beautiful we are at the microscopic level. 📷 : Science Photo Library.