Inclusion Criteria:  ASA I-II Volunteers  Exclusion Criteria:  Upper extremity trauma Cervical trauma Muscle weakness Cervical disc herniation History of spine surgery Cranial surgery, Neuromuscular disease Clinical diagnosis of brachial plexopathies Hyperlipidemia Diabetes mellitus Radiotherapy history in the cervical region Severely obese volunteers (body mass index> 35 kg / m2)