 Now let's continue with another branch of the femoral nerve. So again, I have lifted up the femoral nerve And we can see these two branches the lateral one this one This is the one which supplies the extra media list This is the nerve to vestus medialis and the medial one is a very crucial nerve This is called the saphenous nerve both these nerves They pass through a canal which is known as a detector canal or the sub sartorial canal While it is in the detector canal We can see the saphenous nerve is giving these branches one is this branch And this pierces through the detector canal and supplies the skin of the anterior medial thigh Then we can see it another branch this also pierces through the detector canal And it supplies the skin of the medial thigh then we can see a saphenous nerve passes out of the detector canal And we have lifted up the other end of it We have purposely redeemed a little bit of the sub sartorial fascia to show you the exact location Where we see the saphenous nerve is coming out the saphenous nerve then runs posterior medial to the knee Undercover of the sartorials. This was the location of the sartorials And I'm going to reflect the sartorials We can see the coast of the saphenous nerve here the saphenous nerve then passes under the sartorials And now it has come on to the medial side of the leg in this position We can see that the saphenous nerve is accompanied by this superficial vein This is the long saphenous vein so we can see the saphenous nerve accompanying the long saphenous vein They're running on the medial side of the leg. This is the long saphenous vein This is the saphenous nerve both of them are traveling on the medial side of the leg syphilis vein goes in front of the medial malulus and this goes and both of them come to the medial side of the foot. So therefore the distribution of the syphilis nerve is all the way part of the medial side of the foot, most of the medial side of the leg, a little bit of the anterior, a little bit of the posterior medial, medial side of the knee and it supplies skin to the medial side of the thigh lower portion. So this is the full distribution of the syphilis nerve. Here we can have an important clinical correlation. This long syphilis vein is used for many surgical purposes, for many puncture, for many section, for long-term intravenous fluid and it is also harvested for coronary artery bypass grafting. When we are operating on this long syphilis vein, we are liable to inadvertently injure the syphilis nerve, in which case the person will have again numbness, tingling and peristicia on a variable distribution on the medial side of the leg and the foot. So this is the full course of the syphilis nerve that we can see. The syphilis nerve is the longest cutaneous branch in the human body. It is the only branch of the femoral nerve which goes outside the thigh. As we saw a little while earlier, femoral nerve completely finishes inside the thigh itself by giving all these branches. But the syphilis nerve continues outside the thigh. So therefore that is the importance of the syphilis nerve that we can see here. And finally, before I conclude, I want to show you the continuation of the adductor canal or the sub-sartorial canal. I put my hand here and we can see that it is disappearing somewhere because in this particular dissection, in this particular view, we cannot see. But my finger has reached an opening and that opening is called the adductor hiatus. How can we locate the adductor hiatus from this view? We can see this shiny structure here. This is the adductor tendon. The adductor tendon is the hamstring part of the adductor magnus. This is the adductor magnus and this adductor tendon gets attached to the adductor tubercle and this forms the medial boundary of the adductor hiatus. That is the limit of the adductor canal. At the adductor hiatus, femoral artery and the femoral vein, they become popliteal artery and popliteal vein. But the syphilis nerve, as we saw, it does not go up to the adductor hiatus. Instead, it pierces through the sub-sartorial fascia and we can see that here and it comes out of the adductor canal and it runs under the sartorial muscle on the medial side of the knee. In the adductor hiatus, the femoral artery can get potentially trapped. That is referred to as entrapment syndrome of the femoral artery. That is one of the sites where the femoral artery or the popliteal artery can get entrapped.