Chapter 7, Problem 22RA

Summary Introduction

To review:

Conduction of action potentials in myelinated axons.

Introduction:

Myelinated axons have myelin sheaths across the length of the axon. The myelin found in the Central nervous system (CNS) comes from wrappings of Schwann cells and in Peripheral nervous system (PNS), it is derived from oligodendrocytes. They serve as insulation for the axons by preventing movement of Na+ (sodium) and K+ (potassium) ions across the membrane.