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Soleus muscles have more slow muscle fibers than many other muscles. In some animals, such as the guinea pig and cat, soleus consists of 100% slow muscle fibers. [6] [7] Human soleus fiber composition is variable, containing between 60% and 100% slow fibers. [8] The soleus is the most effective muscle for plantar flexion in a bent knee position.
The soleal line marks the lower limit of the insertion of the popliteus muscle. [2] It is the attachment of the fascia covering this muscle. It is the origin of part of soleus muscle (along with a triangular area above it), [ 3 ] flexor digitorum longus muscle , and tibialis posterior muscle .
The gastrocnemius is made up of fast-twitch muscle fibres, which benefit more from heavy loads and low reps on the standing calf raise, while the soleus is a slow-twitch muscle and benefits from higher reps and lower loads on the seated calf raise. [3] [4]
The muscle which can 'cancel' or to some degree reverse the action of the muscle. Muscle synergies are noted in parentheses when relevant. O (Occurrences) Number of times that the named muscle row occurs in a standard human body. Here it may also be denoted when a given muscles only occurs in a male or a female body.
Along with the soleus muscle, the gastrocnemius forms half of the calf muscle. Its function is plantar flexing the foot at the ankle joint and flexing the leg at the knee joint. The gastrocnemius is primarily involved in running, jumping and other "fast" movements of leg, and to a lesser degree in walking and standing.
The triceps surae consists of two muscles located at the calf – the two-headed gastrocnemius and the soleus.These muscles both insert into the calcaneus, the bone of the heel of the human foot, and form the major part of the muscle of the posterior leg, commonly known as the calf muscle.
The plantar muscles can be subdivided into three groups associated with three regions: those of the big digit, the little digit, and the region between these two. All these muscles are covered by the thick and dense plantar aponeurosis, which together with two tough septa, form the spaces of the three groups. These muscles and their fatty ...
Soleus: Posterior aspect of head and superior quarter of posterior surface of fibula; soleal line and middle third of medial border of tibia; and tendinous arch extending between the bony attachments: Plantarflexes ankle independent of position of knee; steadies leg on foot