Inclusion Criteria:  Patients' acceptance. ASA I and II. Age above 21 years and below 60 years in both sexes. Cooperative patients. Patients with a BMI (body mass index) ranged from 18.5 to 30 kg/m2. Patients who scheduled for elective posterior cervical spine surgeries  Exclusion Criteria:  Patients with cardiovascular or respiratory compromise. Coagulopathy. Advanced hepatic or renal diseases. Local tissue infection. Allergy to local anesthesia.