 So we have turned the anti-h-sht wall after we have removed it from the cadaver and we want to show some salient points on the Inner surface of the anti-h-sht wall. So just to bring up the speed, this is the inner surface of the manubrium sternum This is the juggler notch This is the body of the sternum and this is the zephyde process So therefore, this is the manubrium sternum joint and this is the zephyr sternum joint We notice these strap passes of the neck the sternum hyoid and the sternum thyroid which are attached to the inner surface of the manubrium sternum and they go up to the neck. On either side of the sternum, we notice very salient points We notice these vascular structures here These are the internal thoracic artery and the internal thoracic vein. The vein is medial artery lateral They come from the succlevein artery The first part of the succlevein artery and they descend down on either side of the sternum These are very important arteries. As they descend down they provide anterior intercostal arteries, two of them, and these they go and they anastomose with the posterior intercostal arteries. The internal thoracic artery gives anti-intercostal arteries in the first to the sixth space. From the seventh space downwards, the internal thoracic artery divides into a musculophrenic and a superior epigastric The musculophrenic suppress the diaphragm and this musculophrenic gives anti-intercostal arteries in the seventh, eighth, and ninth spaces and we can see the division here Likewise on the other side also we can see the internal thoracic artery dividing and it's giving rise to musculophrenic and the superior epigastric. The superior epigastric goes to the anterior abdominal wall and the musculophrenic supplies the diaphragm and it gives the seventh, eighth, and ninth spaces This internal thoracic artery is especially the left one is used for coronary artery bypass grafting and that is known as left internal memory artery anastomosis, lima anastomosis. This provides certain useful advantages because it is already arising from the subclavian artery We need to anastomose only one end to the coronary artery. So double anastomosis is avoided. So that is why this is the preferred artery for coronary artery bypass grafting. The point to be remembered about the vein is that the vein is located medial to the artery up to the second rib It is a vein but below that it becomes a venae cometantes and we can see that here Below the second rib it is venae cometantes and from the second rib upwards it becomes a full vein Both these artery and vein they run between this muscle here and we can see that muscle here also That is the transversus thoracus muscle. It runs between the transversus thoracus muscle and the internal intercostal muscle. The transversus thoracus muscles are arising from the anterior part of the chest wall on the inner surface And they give multiple slips to the ribs on the inner side and we can see them here and we can also see them here So therefore the transversus thoracus the innermost intercostal and the subcostal are considered as one continuum And it runs between the transversus thoracus and the internal intercostal And this transversus thoracus then continues into the abdomen and it merges with the transversus abdominus muscle of the abdomen I would draw your attention to this tiny structure that we see here on the inner surface of the chest wall And we can see very clearly here. This is the parietal pleural And deep to the parietal pleural and we have lifted it up here Only the endothoracic fascia And the neurovascular structures initially they run in the endothoracic fascia before they run between layers 2 and 3 of the chest wall So this is the parietal pleura which we have stripped off and this is the endothoracic fascia And before concluding I would like to draw your attention To these muscle fibers that we can see on either side These are the remnants of the diaphragm Which are attached to the lower ribs the costal part of the diaphragm We can see the fibers here and we can see the fibers here So these are all the structures which I wanted to show you on the inner surface of the entry chest wall Thank you very much for watching. If you have any questions or comments, please put them in the comment section below Have a nice day