Introduction.- Principles of Macroscopic and Microscopic Anatomy of Peripheral Nerves.- Pathophysiology.- egrees of Nerve Lesion.- Types of Tissue Reaction Following Nerve Lesion.- Clinical Presentation of Nerve Lesion.- Different Types of Pain Following Nerve Lesion.- Principles of Neurophysiologic Diagnosis.- Electroneurography.- Electromyography.- Imaging of Peripheral Nerves.- Sonography.- Magnetic Resonance Imaging.-Principles of Nerve Surgery.- Neurolysis Steps.- Grafting Following Nerve Trauma.- Nerve Entrapment at Shoulder and Arm.- Spinal Accessory Nerve.- Brachial Plexus, Thoracic Outlet Syndrome.- Suprascapular Nerve.- Axillary (Circumflex) Nerve.- Radial Nerve at Upper Arm.- Radial Nerve at Lower Arm.- Posterior Interosseous Nerve Entrapment.- Superficial Radial Nerve Entrapment.- Median Nerve at Elbow.- Median Nerve at Lower Arm.- Anterior Interosseous Nerve Entrapment.- Carpal Tunnel Syndrome.- Ulnar Nerve at Elbow.- Ulnar Nerve at Lower Arm.- Guyon's Loge Syndrome.- DeepUlnar Branch Entrapment.- Nerve Entrapment at Trunk and Leg.- Genitofemoral, Ilioinguinal, Iliohypogastric Nerve.- Femoral Cutaneous Nerve.- Obturator Nerve.- Saphenous Nerve.- Infrapatellar Branch of Saphenous Nerve.- Pudendal Nerve.- Sciatic Nerve, Piriformis Syndrome.- Fibular Nerve at Knee Joint.- Fibular Nerve at Ankle, Anterior Tarsal Tunnel Syndrome.- Tibial Nerve.- Tibial Nerve at Ankle, Posterior Tarsal Tunnel Syndrome.- Tibial Nerve at Sole, Morton's Metatarsalgia.- Non Mechanical Focal Neuropathies.- Parsonage Turner Syndrome.- Multifocal Motorical Neuropathy.- Hereditary Multifocal Neuropathy.- Lewis-Summer-Syndrome (CIDP).- Immune Vasculitis with Focal Neuropathy.