Posterior ramus of spinal nerveLateral branches ofintercostal nerveand vesselsAnterior cutaneousbranch ofintercostal nerve Anterior perforatingbranches ofintercostal vessels Intercostal nerveCostal grooveAortaInternal thoracic arteryand veinPosterior intercostal artery and veinAnterior intercostal artery and veinCollateral branches ofintercostal nerve and vesselsIntercostal veinIntercostal arteryVisceral pleuraParietal pleuraEndothoracic fasciaPleural cavityLungIntercostal nerveCollateral branchesInternal intercostal muscleExternal intercostal muscleSerratus anterior muscleInnermost intercostal muscleSuperficial fasciaSkinAB