Peripheral Nervous System

This cross section of a peripheral nerve demonstrates the appearance of myelinated axons and a bundle of unmyelinated axons. Unmyelinated axons in the PNS are embedded into the Schwann cells; the Schwann cells and associated axons constitute a REMAK bundle. The nerve is surrounded by epineurium. Within the connective tissue, note the numerous fibroblasts, pinkish collagen fibers, and the blood vessel in the upper right hand corner. Within the nerve, identify myelinated axons. UCLA Histology Collection