Nerves of the peripheral nervous system (PNS) are composed of numerous bundles of nerve fibers that are surrounded by connective tissue. This connective tissue also contains a specific layer that is specialised to neurons; the [[PNS Structure - Anatomy & Physiology#Structure|''peri-neurium'']]. The outer layer of this connective tissue is called the [[PNS Structure - Anatomy & Physiology#Structure|''epineurium'']] and it surrounds both the perineurium and the nerve itself. Individual neurons found within each bundle are surrounded by the [[PNS Structure - Anatomy & Physiology#Structure|''endoneurium'']]. | Nerves of the peripheral nervous system (PNS) are composed of numerous bundles of nerve fibers that are surrounded by connective tissue. This connective tissue also contains a specific layer that is specialised to neurons; the [[PNS Structure - Anatomy & Physiology#Structure|''peri-neurium'']]. The outer layer of this connective tissue is called the [[PNS Structure - Anatomy & Physiology#Structure|''epineurium'']] and it surrounds both the perineurium and the nerve itself. Individual neurons found within each bundle are surrounded by the [[PNS Structure - Anatomy & Physiology#Structure|''endoneurium'']]. |