In spinal anaesthesia the segmental level of:
Spinal anaesthesia creates a zone of differential blockade in which sympathetic fibres are blocked two segments higher and motor fibres are blocked two segments lower than the level of sensory block.
Sympathetic block is lower than the sensory block
Sympathetic block is higher than the sensory block
Motor block is higher than the sensory block
Sympathetic, motor and sensory block has the same level
Anaesthesia