This book focuses on the anatomy of the peripheral nervous system. Using the latest 3D-computer graphic modeling techniques, the author developed the innovative NEURO 3D LOCATORTM concept, which provides 3D in-vivo ultrasound images of peripheral nerve architectures, allowing readers to develop a mental real-time 3D GPS of the peripheral nervous system. This new edition is an extended version of the “Student edition” dedicated to Experts and is divided into three main parts: The first part describes fundamental concepts, from immunohistochemistry to limb innervation, and includes a detailed evaluation of the morphofunctional anatomy of the peripheral nerves. It also presents relevant data on neuromuscular transmission, from both classic and recent literature, to enable readers to gain an understanding the physiology and pathology of peripheral nerves as well as the prospects of repair. The second section addresses the upper limb, the brachial plexus and related peripheral nerves, while the third section focuses on the lower limb, the lumbosacral plexus and related peripheral nerves.