Compartments of leg and thigh4/11/2023 ![]() ![]() The extensor hallucis longus muscle originates off the interosseous membrane, but also off the anterior fibula.Īs its name implies, extensor hallucis longus inserts on and extends the great toe, and as a longus muscle, it goes the long way and inserts on the distal phalanx. This article comes directly from content in the video series How We Move: The Gross Anatomy of Motion. And because it crosses the medial aspect of the ankle to insert on the foot, does it invert or evert the foot? Yes, tibialis anterior causes inversion. The large tendon of tibialis anterior can be easily seen passing across the anterior and medial aspect of the ankle, to insert on the medial cuneiform and the base of the first metatarsal.īecause it crosses the anterior ankle, does tibialis anterior dorsiflex or plantar flex? The right answer is dorsiflex. It takes origin from the proximal half of the tibia’s lateral surface, as well as the interosseous membrane. When one feels along their shin, the muscle mass immediately lateral to the sharp crest of the tibia is tibialis anterior. The other issue relates to chronic mispronunciation some people call these “perineal” muscles, and we know the perineum is the diamond-shaped region between the thighs, which is nowhere near the leg or the fibula. This is partly because peroneus is Latin for the Greek term for the fibula, so this will mix the Greek for the fibula with the Latin word tibia. In anatomy, the word peroneus is gradually being replaced by fibularis. There are four muscles in the anterior leg-tibialis anterior, extensor hallucis longus, extensor digitorum longus, and a small muscle-almost like a bonus tendon-called fibularis tertius, also known as peroneus tertius. (Image: Medicalstocks/Shutterstock) Muscles in the Anterior Leg Severe damage to the nerve and blood vessels around a muscle can cause the muscle to die and amputation might be necessary.The anterior compartment of the leg consists of four muscles that work together to facilitate movement. 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. All of the muscles within a compartment will generally be supplied by the same nerve. The compartments usually have nerve and blood supplies separate from their neighbours. The compartments are divided by septa formed from the fascia. The fascial compartments of the leg are the four fascial compartments that separate and contain the muscles of the lower leg (from the knee to the ankle). ![]()
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