 This is going to be demonstration of the lateral compartment of the leg. The lateral compartment is located between the anterior intramuscular septum and the posterior intramuscular septum. We have lifted up the anterior intramuscular septum. It is attached to the anterior border of the fibulae and we can see a remnant of that here. An anterior intramuscular septum separates the lateral compartment from the anterior compartment and this is the remnant of the posterior intramuscular septum which is attached to the posterior border of the fibulae. fibula. So, therefore, the lateral compartment is situated between the anterior and the posterior border of the fibula between the respective intramuscular septic. The contents of the lateral compartment are two muscles and we can see both the muscles here. This muscle that we can see arising from the upper part of the fibula and then continuing down as a tendon behind the lateral maniolaus. This is the fibula wrist longus and arising from lower down on the fibula and then also continuing behind the lateral maniolaus. This is the fibula wrist brevis. The fibula wrist longus, tendon and the fibula wrist brevis, both of them are held in place behind the lateral maniolaus by means of the fibula regionocular and the fibula wrist longus tendon then continues deep and it runs across the sole of the foot in layer number 4 from lateral to medial and it gets attached to the medial uniform and the first metatarsal from the lateral aspect. This fibula wrist longus is a powerful ewarder of the foot and it also helps to maintain the transverse arch of the foot. The fibula wrist brevis runs also behind the anionis and then it gets inserted onto the tuberosity of the fifth metatarsal bone which is felt here and we can feel the tuberosity of the fifth metatarsal bone in our leg also. This is also an ewarder of the foot. At the point of insertion of the fibula wrist brevis, there can be a ewarder fracture of the tuberosity of the fifth metatarsal and that is known as Dancer's fracture. That typically happens when the fibula wrist brevis is actively contracting and the foot is in the eversion and if the foot by any means is forcibly inverted then the traction is exerted on the tuberosity of the fifth metatarsal bone leading to ewarder fracture also called Dancer's fracture. Now let's come to the durability supply. We have retained the nerve here. This is the superficial fibular nerve and we can see the nerve is running from here. It runs between the fibula wrist longus and the fibula wrist brevis and this is the one which supplies both the fibula wrist muscle. Superficial fibular nerve, one of the smaller terminal divisions of the common fibular nerve. The common fibular nerve goes behind the head of the fibula. It runs on the lateral aspect of the neck of the fibula and then it divides into superficial fibular which runs on the lateral compartment and the deep fibular which runs in the anterior compartment. The superficial fibular after it has supplied these two muscles, the fibularis longus and the fibularis brevis, in this place where we can see, where we have lifted, this is the place where it appears the cruel fascia of the leg and it becomes subcutaneous and then after it runs on the antrolateral aspect of the lower one third of the leg like this, it runs superficial to the extensor retiniculum and it supplies the skin of the entire dorsum of the foot except the first intermediate dorsum interdigital cleft. So, this is the full course of the superficial fibular nerve. The lateral compartment does not have any artery separate of its own and we can see some of these arterial branches. These are all branches which come from the anterior compartment from the anterior tibial artery. Superficial fibular nerve injury usually does not occur separately because it is located deep. However, the common fibular nerve as it is winding around the neck of the fibula, it can get injured in fracture of the neck of the fibula in which case the paralysis of the fibularis longus and the fibularis brevis. But much more important than this that injury to the common fibular nerve will also paralyze the deep fibular nerve and that will lead to foot trauma which is a much more serious disadvantage. Patients who get repeated inversion injuries of the foot, they can get attraction neuropathy of the superficial fibular nerve. That is one clinical manifestation of the superficial fibular nerve. In very thin individuals, sometimes the branches of the superficial fibular nerve may be visible if the the toes are extended and the foot is stretched. Then this can be a potential site of giving nerve block to anesthetize the dorsum of the foot, the superficial fibular nerve. Please note that the superficial fibular nerve runs superficial to the extensor retiniculum as opposed to the deep fibular nerve which runs deep to the extensor retiniculum. So therefore, the superficial fibular nerve does not get entrapped under the extensor retiniculum. So these are the points I wanted to mention about the muscles of the lateral compartment that we can see here. Thank you very much for watching. Dr. Sanjay Sanyal signing out. If you have any questions or comments, please put them in the comment section below. Have a nice day.