 Good day everybody. This time I am going to show you something very unique. My name is Dr. Sanjay Sanyal, professor of department chair. This muscle which I have lifted up in my hand, this is the Lame tendinosis, which is muscle of the posterior compartment and it forms a supra-medial boundary of the perpendicular force. And you can see that the lower part of it is tendinous and it gets inserted onto the upper medial aspect of the TBL. The next muscle which I am lifting up now is the graces. This is the muscle of the medial compartment and here also you can see the lower part is tendinous and it is used for stincture repair. And I am lifting up the third muscle which is the lower part of the sartorius. The sartorius muscle is a muscle of the anterior compartment. What is so unique about these three muscles is that one muscle belongs to the posterior compartment, one muscle belongs to the medial compartment and sartorius belongs to the anterior compartment. And all of these three muscles, they come and get inserted onto the upper medial aspect of the tibia in a very unique insertion which I have lifted up by means of this tape here and that insertion is referred to as the pestanserinas. Pestanserinas literally means the foot of a goose. And if you look very carefully, you find that this insertion of the semitendinosis, it expands, the one below that is the insertion of the gracilis and the one deep is the insertion of the sartorius and they all form an expanded insertion which somewhat resembles the foot of a goose. This is called the pestanserinas. Having mentioned that, let me mention two functional aspects about this pestanserinas. As I mentioned, the pestanserinas is an insertion on the medial side of the tibia of three muscles and this is counterbalanced by another insertion on the lateral aspect by this aponeurotic sheet that we see here. This aponeurotic sheet is the iliotibial tract and the iliotibial tract inserts onto the anterior-lateral tubercle of Gerdin on the tibia. So we have a corresponding insertion on the lateral aspect of the tibia and an insertion on the medial aspect of the tibia. And we know that the iliotibial tract is actually the aponeurotic expansion of the glucus maximus and the tensorfacial tract. So therefore, one of the postulates is that the iliotibial tract by virtue of its insertion onto the lateral aspect of the tibia counterbalances the insertion of the pestanserinas on the medial aspect of the tibia. So that is one aspect of the story. There is yet another aspect and that is if we were to consider all these five muscles namely the two on the lateral aspect, the glucus maximus and the tensorfacial tract and the three muscles on the medial aspect namely the sartorius, gracilis and semitidinosus the origin of all these five muscles are from the pelvic bones. So therefore, in effect all these five muscles they are acting across two joints they are acting across the hip joint and they are acting across the knee joints. So therefore, it is also postulated that these two lateral muscles and the three medial muscles they help to stabilize both the hip and the knee joint. So these are a few postulates and a few theoretical considerations pertaining to the pestanserinas which is a rather unique insertion on the medial side matched by the corresponding insertion of the iliotibial tract on the lateral side. That is all for now. Thank you very much for watching ladies and gentlemen. Dr. Sanjay Sanyal signing out. Have a nice day. So guys, don't forget to like this video, subscribe and leave your questions in the comment section.