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Gray438png
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Muscles of the back of the leg Superficial layer
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Lateral supracondylar ridge of Femur above lateral head of gastrocnemius
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Tendo Calcaneus (medial side, deep to Gastrocnemius tendon)
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Plantar flexes foot and flexes knee
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Tibial Nerve
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is a
Vestigial Structure and one of the superficial
Muscles of the posterior crural compartment of the leg. It arises from the inferior part of the lateral supracondylar line of the
Femur at a position slightly superior to the origin of the lateral head of
Gastrocnemius . Also, it may arise from the oblique
Popliteal Ligament . Passing inferomedially posterior to the knee joint, it becomes tendinous while passing distally to insert into the
Tendo Calcaneus , or occasionally separately inserting into the medial side of the calcaneus.
It is innervated by the
Tibial Nerve (S1, S2).
Plantaris acts to weakly:
- plantarflex the ankle joint
- flex the knee joint
Its function is so minimal that its long tendon can readily be harvested for reconstruction elsewhere with little functional deficit. "Often mistaken for a nerve by freshman medical students, the muscle was useful to other primates for grasping with their feet. It has disappeared altogether in 9 percent of the population."
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