 Now, let me show you some important neurovascular structures which are present in the posterior compartment. So, let's start out with the most obvious, that we can see here, the sharding nerve. The sharding nerve descends into the thigh between the crater trochanter and the osteotorostomy, and we can see descending down, here it runs on the deep group of gluteal muscles. Then it runs on the back of the thigh, and here it runs between the two layers of hamstring muscles. The semi-vampiric noses, semi-typing noses, and the bicep femoris are superficial, and on the deep aspect we have the tractor magners. So, it runs between these two layers, and we can see it running here. At the junction of the upper two-thirds, lower one-third, or sometimes even in the percolator furser, the sharding nerve divides into a tibial division and a common femoral division, and thereafter it continues with the leg. The sharding nerve is accompanied by the posterior femoral cutaneous nerve, and we can see the posterior femoral cutaneous nerve here. This posterior femoral cutaneous nerve supplies the skin of the back of the thigh, and it also gives a branch called the inferior crudial nerve, which supplies the lower part of the skin of the butt, which is the S23 anterior division component of the posterior femoral cutaneous nerve. So, this is the sharding nerve. Sharding nerve is likely to be injured in a wrongly inserted intramuscular injection in the butt or in posterior dislocation. Sharding nerve is the largest nerve of the human body, and it supplies all the structures in the back of the leg right up to the foot. So, that is the one important neurovascular structure that we can see here. The next important neurovascular structure, the posterior compartment does not have any special separate artery of its own. So, therefore, the entire arterial supply is by means of the perforator branches of the perforator femoris. Let's take a look at the perforators. There are four perforators which come from the perforator femoris. We will use the insertion of the adductor magnus onto the linear aspirin as our starting point. It forms a bed, and lying on the bed, we have the perforator femoris, which is on the anterior compartment. And we are seeing the adductor magnus. We have four arteries which are referred to as the perforator arteries. This is the first one, which I have lifted up here, artery and vein. This is the first perforator. This first perforator participates in the cruciate anastomosis, and we can see it's giving a branch. And this first perforator also continues and supplies the structures in the back of the thigh, which I shall show you just now. This is the second perforator, which I have lifted up here. This also is perforating, and we can see the perforation where it is perforating through the adductor magnus. And this is also giving branches to the posterior compartment of the thigh. Now let's come to the third perforator. This is the third perforator. This is perforating lower down, and it is supplying the muscles in the back of the thigh. And finally, we have the fourth perforator. This is the fourth perforator, which I have lifted up here. And this is a combination of artery and vein. These are the fourth perforator. And we can clearly see these perforators are the ones which are supplying the muscles in the back of the thigh. So let's see the full vascular structures in the back of the thigh. So this is the branch for the first perforator. I have retracted the muscles to show you. And this is running on the back of the thigh in the neurovascular plane between the superficial group of handshree muscles and the adductor magnus. And as they run down, if I retract this, we can see that they're running behind the muscles, along with branches of the TBL division of sciatic nerve, and they're supplying the muscles. And we can see that very clearly here. And they are also anastomosing with each other. So this is the vascular supply of the back of the thigh and the hamstring muscles, which is achieved by means of the perforators, which came from the profundum femoris artery. Since we are at the back of the thigh, I would like to draw your attention to another important structure. I have removed all these muscles to show the adductor component of the adductor magnus. And we can see that this is the hamstring component. And there's a tenderness portion here. This is the adductor tendon of the adductor magnus. There is an opening, and my instrument has gone into that opening. And now I'm going to put my finger also into that opening. And I put my finger inside. This opening is known as the adductor hiatus. This adductor hiatus is located between the insertion of the tenderness insertion of the adductor magnus, namely the adductor tendon, and the fleshy portion of the adductor magnus, which is inserted onto the linea aspera. Emerging through the adductor hiatus, we have the continuation of the femoral artery and the femoral vein. They emerge from here, and they come to the posterior aspect of the thigh, and they go into the paupitil fossa. And here they change the name from femoral artery to paupitil artery. And from femoral vein, they become paupitil vein. This adductor hiatus is one site of entrapment of the paupitil artery. So that is one point which I wanted to draw your attention to. And we can see that this adductor hiatus is situated rather close to the site of the fourth perforator, which I mentioned a little while back. That's all for now. Thank you very much for watching. Dr. Sanjay Saria signing out. If you have any questions or comments, please put them in the comment section below. Have a nice day.