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The sliding filament theory explains the mechanism of muscle contraction based on muscle proteins that slide past each other to generate movement. [1] According to the sliding filament theory, the myosin ( thick filaments ) of muscle fibers slide past the actin ( thin filaments ) during muscle contraction, while the two groups of filaments ...
The tibialis anterior muscle is the most medial muscle of the anterior compartment of the leg. [1] [better source needed] The muscle ends in a tendon which is apparent on the anteriomedial dorsal aspect of the foot close to the ankle. [citation needed] Its tendon is ensheathed in a synovial sheath.
The anterior compartment of the leg is supplied by the deep fibular nerve (deep peroneal nerve), a branch of the common fibular nerve. The nerve contains axons from the L4, L5, and S1 spinal nerves. Blood for the compartment is supplied by the anterior tibial artery, which runs between the tibialis anterior and extensor digitorum longus muscles.
An impulse from a nerve cell causes calcium release and brings about a single, short muscle contraction called a muscle twitch. If there is a problem at the neuromuscular junction, a very prolonged contraction may occur, such as the muscle contractions that result from tetanus. Also, a loss of function at the junction can produce paralysis. [5]
Tibial tuberosity fractures are infrequent fractures, most common in adolescents. In running and jumping movements, extreme contraction of the knee extensors can result in avulsion fractures of the tuberosity apophysis. [3] A cast is all that is required if the fragment is not displaced from its normal position on the tibia. However, if the ...
Between it and the tibialis anterior are the upper portions of the anterior tibial vessels and deep peroneal nerve. The muscle passes under the superior and inferior extensor retinaculum of foot in company with the fibularis tertius , and divides into four slips, which run forward on the dorsum of the foot, and are inserted into the second and ...
tibialis anterior: 2 1 soleus: Lower Limb, Leg, Calf fibula, medial border of tibia (soleal line) tendo calcaneus: sural arteries: tibial nerve, specifically, nerve roots L 5 –S 2: plantarflexes ankle: tibialis anterior: 2 1 plantaris: Lower Limb, Leg, Posterior compartment, Superficial lateral supracondylar ridge of femur above lateral head ...
The tibia (/ ˈ t ɪ b i ə /; pl.: tibiae / ˈ t ɪ b i i / or tibias), also known as the shinbone or shankbone, is the larger, stronger, and anterior (frontal) of the two bones in the leg below the knee in vertebrates (the other being the fibula, behind and to the outside of the tibia); it connects the knee with the ankle.