 Yes, so this is going to be a demonstration of the branches the lumbar plexus This is the right side of the cadaver and the camera person is also the right side The lumbar plexus as you know is formed under the Suas major muscle So therefore if you remove the Suas major muscle, then only can see the formation of the lumbar plexus We can see the beginning of the formation of the lumbar plexus by retracting the Suas major So let's take a look at the branches and we shall see the branches coming out at the posterior terminal wall And we shall trace the relevant branches right up to the thigh or any place distally Not exactly in the part of the lumbar plexus, but let's start from the first now that we can see here This is the sub-costal nerve T12 this is the one which arises just from under the twelfth rib. That's why it's the sub-cost The next now that we can see here in front of us. This is L1 This is the ilioinguinal and iliohypogastric This comes out and it divides lower down into ilioinguinal and iliohypogastric, and we can see the division here Iliohypogastric it supplies only the skin of the abdomen just above the inguinal ligament It does not go below that and it also supplies the internal oblique and transverse abdominis fibers lower down The ilioinguinal nerve on the other hand continues through the inguinal canal and it continues into the genitalia And it supplies the skin of the antrimedial thigh and Antire part of the labia majora in the female or the scrotum and here It is referred to as the anterior labial or anterior scrotum nerve The ilioinguinal also supplies the lower fibers of the internal oblique and the transverse abdominis muscle in the lower part of the Abdominal so this is the full distribution of the L1 that is ilioinguinal and the iliohypogastric The next branch that we can see here is this one This is a branch of the femoral to the iliacus muscle, which is here the next branch that we can see here is another which I have picked up This is the lateral femoral cutaneous nerve This lateral femoral cutaneous nerve runs under the inguinal ligament and this is the inguinal ligament It runs under the lateral part of the inguinal ligament just where it takes attachment from the Antire superior iliac spine and then it comes to the thigh and this is the other end of the lateral femoral cutaneous nerve So this is inside the pelvis and this is in the thigh as the term plays lateral femoral cutaneous nerve It divides into multiple cutaneous branches and we can see all the cutaneous branches here and it supplies the skin of the Antrolateral aspect of the thigh. There's an important clinical correlation pertaining to this though It is not very common. This lateral femoral cutaneous nerve can get entrapped under the inguinal ligament and the sartorius muscle This is the sartorius muscle And it is emerging from under the inguinal ligament under the anterior superior iliac spine Especially when a person gains weight, then it can produce the nerve entrapment and it can produce numbness tingling and peristaceia on the antrolateral aspect of the thigh and that condition is referred to as Meralgia peristhetical The next branch that we can see here is this big branch here And we can see the origin of the branch When I retract the suase major and we can see that this is the origin of the branch This is the femoral nerve l234 posterior division And we can trace the femoral nerve under the inguinal ligament and i'm doing that right now And i have lifted up the inguinal ligament and this is the femoral nerve the femoral nerve enters The thigh in the subinguinal space Along with the tendons of this iliosuase which we can see here. So therefore it is located in the lateral compartment subinguinal compartment And immediately thereafter we can see it is dividing into Numerous branches which supply the muscles of the anterior aspect of the thigh So therefore it is a nerve of the anterior compartment. It is responsible for Flection of the hip and extension of the knee. It also gives a large cutaneous branch Which supplies the anterior major part of the anterior part of the skin of the thigh And it also gives the saphenous nerve which runs on the median side of the leg So that is about the full course of the femoral nerve Now let's retract the suase major further and we can see this nerve coming out This is the genitofemoral nerve the genitofemoral nerve l12 as the term implies It supplies the genitalia as well as the femoral skin. So it also goes through the inguinal canal in the males It supplies the cremaster muscle, but this is the female cadaver. So therefore it is there's no supply in the cremaster In the thigh it supplies the upper anterior part of the thigh skin And then it continues the genital part and it Goes in supplies the anterolateral part of the labia majora or the scrotum. So that is the full course of the genitofemoral nerve Since I've already mentioned the ilioeminal nerve and I mentioned the genitofemoral I can mention something called cremaster reflex again in the female the cremaster reflex does not exist But it is relevant in the males cremaster reflexes when we stroke the skin of the upper medial thigh The testis is retracted up toward the inguinal canal. That is called cremaster reflex It is more prominent in the young children, male children Afferent limb of this cremaster reflex is the ilioeminal nerve because it carries the sensation Afferent limb of this is the genital branch of the genitofemoral which supplies the cremaster muscle Let's continue with other branches Again, we are on the medial side of the suas major and we can see this nerve here This is the operator nerve We can trace the operator nerve It enters the operator canal along with the operator artery and the operator vein The operator canal is an opening in the operator forearm covered by the operator membrane And it comes on the medial side of the thigh. Now we have come to the medial side of the thigh I have retracted the adductor longus here And this is the adductor magnus and we can see the Operator nerve here. It is accompanied by the operator vessels I picked up the whole thing here and it supplies the muscles of the medial compartment, namely the adductor compartment Now what we will do I'm going to put my instrument inside the medial compartment of the thigh So we have put a probe in the reverse direction And we can see that the other end of the probe has come out through the operator foremen here And we can see going through the operator foremen is the operator nerve And the operator artery and we can see the other end of the probe here And here also we can see the operator nerve and the operator vessels So this is the full course of the operator nerve and incidentally also the operator vessels The last branch of the lumbosacral plexus is this one here. This is the lumbosacral trunk L45 This is the component from the lumbar plexus Which goes and joins the sacral plexus and contributes to the formation of the sciatic nerve These are all the branches that we can see now. We are showing the left side of the cadaver I'm standing on the right side and the camera person is also on the right side. This is again The left subcostal nerve T12 the next one that we have picked up here This is the helioenguinal and the heliohypogastric which is l1 The course and the distribution are the same as that we mentioned on the right side So we are not repeating the course the next note that you can see here This is the lateral femoral cutaneous nerve And we can see it is going under the inguinal ligament on the left side The next structure that we can see here. This is a nerve which is going to the glialis muscle Then we have this nerve here. This is the genitofemoral nerve And the genitofemoral nerve is recognized by the fact that it is running on the Lower anterior surface the lower part of the soas major. This is the femoral nerve L234 But we have not opened up the thigh on the left side So therefore we cannot trace it on the thigh, but we know that it goes under the inguinal ligament Then I'm going to retract the soas major further laterally to show you this nerve here This is the operator nerve The operator nerve is also L234 But it is anterior division and we can see it clearly That here also it is entering through the operator canal in the operator membrane And finally we can see one big nerve going down This is the lumbosacral trunk. Lumbosacral trunk is L45 Which goes to the sacral plexus and contributes to the formation of the sciatic nerve So these are all the branches of the lumbar plexus that we can see on the left side So that's all for now about the lumbar plexus and its branches and the relevant clinical correlations Thank you very much for watching. Dr. Sanjay Sanyal signing out. Have a nice day. David O is our camera person