 So this is a quick demonstration of the dissection of the lateral and the anterior compartment of the leg with its muscles and the neurovascular structures. So let's start off from here. This is the common fibular nerve in the lower part of the papilloteal fursum and we can see that it is running under cover of the bicep femoris and as it runs down initially it runs behind the head of the fibula and then it winds around the neck of the fibula. Now here there's a very important clinical correlation. Any fracture of the neck of the fibula can injure the common fibular nerve and can lead to a condition known as foot drop. Let's continue. The common fibular nerve then goes under the attachment, the origin of this muscle here. This is the fibularis longus or as old textbooks say the peroneus longus and under the origin of the fibularis longus it divides into a deep and a superficial branch. Now let's trace the superficial branch. The superficial branch of the fibularis longus is the one which runs in the lateral compartment of the leg. So this is the lateral compartment of the leg. This is the fibula. This is the posterior margin of the fibula. The lateral compartment of the leg is between the posterior intermuscular septum and the anterior intermuscular septum which is attached to the anterior border of the fibula. So this is the lateral compartment. So coming back to the superficial division of the common fibular it runs in the lateral compartment and we can see it is going through the fibularis longus and it supplies the fibularis brevis which is the muscle underneath. And we can see the rest of the common superficial fibular nerve then continues down between the longus and the brevis and at this point where I have picked up this nerve it becomes subcutaneous by piercing the deep fascia of the leg the cruel fascia. And from here downwards it supplies the antrolateral aspect of the leg the lower one third and then it continues and it supplies the most of the skin of the dorsum of the foot except one small portion which is supplied by the deep fibular nerve. So this is the full course of the superficial fibular nerve and this is the superficial fibular division of the common fibular nerve. Now let's trace this muscle here this as I mentioned is the fibularis longus it takes origin from the upper part of the fibula and the tendon then goes behind the lateral malleolus and here it was covered by the fibularis retinaculum the superior and the inferior fibularis retinaculum part of which has been retained here and we can see and here it is attached by means of some fine fascial structures to prevent it from dislodgement and it goes behind and then we can see it is running here and in this point it goes deep to the sole of the foot where my finger has disappeared and it runs in the layer four of the sole of the foot goes all the way across from the lateral to the medial side and gets attached to the medial cuneiform and the first metatarsal bone. So this is the fibularis longus tendon and the most important action of this is it's the most powerful inverter of the foot at the same time because of its long course in the sole of the foot it also helps to maintain the transverse arch of the foot just under that this tendon that we see here this is the fibularis brevis goes behind the lateral malleolus and it's also attached by means of fascia to prevent it from dislodgement but this one as it comes to the foot it goes and gets attached to the tuberosity of the fifth metatarsal. This is also an inverter of the foot and here we have an important clinical correlation pertaining to the fibularis brevis if in a state of contraction of the fibularis brevis when the foot is averted if there is forcible inversion of the foot like for example when a person is dancing on high heels then it can lead to aversion fracture of the tuberosity of the fifth metatarsal and that is known as a dancer's fracture which pertains to this. And finally as I mentioned the course of the superficial fibular nerve which runs like this and supplies the whole of the dorsal of the foot. People who suffer from repeated inversion injuries of the foot they can develop what is known as attraction neuropathy of the superficial fibular nerve. So this is the course and the distribution of the superficial fibular nerve and the lateral compartment muscles. Now let's take a look at the anterior compartment muscles. So these are the anterior compartment muscles. This is between the anterior introspeptum which is attached to the anterior margin of the fibula and the anterior margin of the tibia. This is the crural fascia which was covered by the crural fascia. So the muscles that we see immediately in front of us because this is the prone cadaver and this is the left leg we are going from lateral to medial. The first muscle that we can see on the lateral most part of the anterior compartment is this one here and this is the fibularis tertius and we can recognize it by its the tendon which is a frayed appearance of the tendon. It's got multiple filaments. This is the fibularis tertius and this fibularis tertius also gets attached to the base of the fifth metatarsal. Though this is the muscle of the anterior compartment it is actually an ewarder of the foot. The next muscle that we see is just medial to that and this is the extensor digitorum longus going to the lateral four digits. After that we have the next muscle. This is the one which I picked up here. This is the extensor halosus longus and finally we have this powerful muscle. This is the tibialis anterior. Now that we have mentioned the muscles of the anterior compartment I shall mention the neurovascular structures. So I have separated the extensor halosus longus and we can see this nerve and this artery here. This is the deep fibular nerve and if you look closely here you'll notice that when I exert traction here this is moving. So this is the deep branch of the common fibular. This goes from the lateral to the anterior compartment by piercing through the fibularis muscles and also by piercing through the anterior intermuscular septum and it comes into the anterior compartment. This deep fibular nerve is the one which supplies all the muscles of the anterior compartment and the most important muscle of the anterior compartment which is responsible for dorsiflexion is the tibialis anterior which is the most powerful muscle that we see here and the tendon of which I showed you here. This deep fibular nerve after it has supplied all the muscles it runs under the extensor red nebula and this is a part of the extensor red nebula that we can see here under which all the tendons are running which have been cut here and then it continues and supplies the muscles of the dorsum of the foot which I shall show you in another category and then it goes and supplies the first interdigital cleft skin between the gray two and the second two. This is the course of the deep fibular nerve. Here again there's an important clinical correlation when this nerve is running under the extensor red nebula it can get entrapped there in what is known as the ski boot syndrome. Accompanying this deep fibular nerve is this artery here and this is the anterior tibial artery. The anterior tibial artery is the smaller division of the popliteal artery which we can see in the popliteal fossa and this division occurs high up deep under the soleus muscle and the posterior tibial runs in the posterior compartment and the smaller terminal division anterior tibial runs in the anterior compartment. This anterior tibial artery also runs between the along with the nerve runs between the tibialis anterior and the extensor halosus longus and this gives an anterior tibial recurrent artery to the knee and it also gives dow comes down and it supplies the medial and lateral malleolide and then it goes under the extensor red nebula and becomes the dorsalis pdrv. Because this is a prone cadaver this is the maximum that we can see of the anterior compartment. Thank you very much for watching till now. Stay tuned for the next video in the next compartment.