Each spinal segment has the dominant area Cervical-neck,shoulder,outer arms,hand Thoracic-inner arm,chest, abdomen Lumbar-front of leg and foot Sacral-back of leg and foot (dermatomes) Clinical Note: For determination the level of extradural anesthesia Each spinal segment has the dominant area (dermatomes) Cervical- neck, shoulder, outer arms, hand Thoracic- inner arm, chest, abdomen Lumbar- front of leg and foot Sacral- back of leg and foot Clinical Note: For determination the level of extradural anesthesia