It involves a deletion of dissection instructions on page 10 of Grant's Dissector. Skip over the 6th, 7th and 8th paragraphs in the left column on page 10. Delete the dissection outlined in those paragraphs but read them for content. Try to reach the posterior axillary line with your cut. Detach the serratus anterior from its costal origins and fold it posteriorly out of the way.
Subsequent cuts involve one muscle layer at a time.
Try not to cut too deep, as you will damage the parietal pleura. Pleura is fragile and is easily torn if handled too roughly. Name the parts of a typical rib. External intercostal membrane Internal intercostal mm. Innermost intercostal mm.