3 compartments of leg5/11/2023 Additionally, the fibularis longus tendon’s (FLT’s) course along the plantar aspect of the foot, crossing the transverse and lateral arches of the foot, and inserting on the base of the first metatarsal, cause it to be important in maintaining the transverse and lateral arches, and in lowering the first metatarsal during foot pronation. The fibularis muscles act as antagonists to foot and ankle inversion, which is why they may be injured in inversion ankle sprains. The primary function of the FLM and FBM is eversion of the foot and ankle, while their secondary function is ankle plantarflexion. The lateral leg compartment is narrow and contains the FLM, FBM, the common and superficial fibular nerves, and branches of the anterior tibial artery and fibular artery. The lateral leg compartment is isolated from the other leg compartments by the deep (crural) fascia of the leg laterally, the fibula medially, the anterior intermuscular septa anteriorly, and the posterior intermuscular septa posteriorly. The muscles in the leg are divided into four compartments, the anterior, lateral, posterior superficial, and posterior deep, by intermuscular septa. Therefore, it is important to be aware of the anatomical makeup of the lateral leg compartment, in order to understand potential pathologies and their implications on the function of the lower extremity. Compartment syndrome can have devastating consequences if not managed appropriately, including ischemic necrosis of the lateral leg compartment structures, causing leg dysfunction and potentially leg loss. Additionally, patients may sustain acute compartment syndrome from direct trauma, inversion ankle sprains, prolonged surgical lithotomy position, and other general medical causes. Due to the compact nature of the lateral leg compartment, it is prone to compartment syndrome, with 13.9% to 34.4% of leg pain being associated with chronic exertional compartment syndrome (CECS). Additionally, variations in the spitting of the common fibular nerve into the superficial fibular nerve and deep fibular nerve have been reported, as well as variations in the course and splitting of the superficial fibular nerve. The lateral leg compartment is highly variable morphologically and may have variants such as the fibularis quartus (FQ) muscle, fibularis digit quanti (FDQ), variable insertions of the fibularis brevis tendon (FBT), and supernumerary fibularis muscle bellies. The anterior tibial and fibular arteries, and superficial fibular nerve provide neurovascular supply to the lateral leg compartment. The primary function of the FLM and FBM is foot and ankle eversion, with a secondary function of foot and ankle plantarflexion and maintenance of the foot transverse and lateral arches. Structures with the term “peroneal” have been replaced with “fibular” for anatomical accuracy. Severe damage to the nerve and blood vessels around a muscle can cause the muscle to die and amputation might be necessary.Containing the fibularis longus muscle (FLM) and fibularis brevis muscle (FBM), common fibular and superficial fibular nerves, and branches of the anterior tibial and fibular arteries, the lateral leg compartment is one of the four compartments of the leg. If the pressure becomes great enough, blood flow to the muscle can be blocked, leading to a condition known as compartment syndrome. Blood vessels and nerves can also be affected by the pressure caused by any swelling in the leg. ![]() The thickness of the fascia can give problems when any inflammation present in the leg has little room to expand into. ![]() Due to the great pressure placed on the leg, from the column of blood from the heart to the feet, the fascia is very thick in order to support the leg muscles. The fascia also separates the skeletal muscles from the subcutaneous tissue. ![]() The septa are formed from the fascia which is made up of a strong type of connective tissue. Įach compartment contains connective tissue, nerves and blood vessels. ![]() The lower leg is divided into four compartments by the interosseous membrane of the leg, the anterior intermuscular septum, the transverse intermuscular septum and the posterior intermuscular septum.
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