Fig. 1From: Anatomical dimensions of the lumbar dural sac predict the sensory block level of continuous epidural analgesia during laborMeasurement of the anatomical dimensions of the dural sac by ultrasound. A LF = ligamentum flavum, DDM = dorsal dura mater, VDM = ventral dura mater, ES = epidural space, DS = dural sac. B DSD = dural sac diameter, DSL = dural sac lengthBack to article page