Fig. 1From: Visualization of injectate spread of intercostal nerve block: a cadaveric studyUltrasound-guided dye injection from outside of the thorax. a, b Ultrasound images of the intercostal space before (a) and during (b) dye injection around the intercostal nerve in a cadaver. Arrow-heads show the needle, and arrows show the descent of the parietal pleura R rib. c Photograph showing the spread of dye from the extrapleural to the paravertebral space in a cadaver. The parietal pleura is turned outwards. Cep cephalad, Lat lateralBack to article page