GASTROCNEMIUS
| ORIGIN Lateral head: posterior surface of lateral condyle of femur and highest of three facets on lateral condyle. medial head: posterior surface of femur above medial condyle |
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| INSERTION Tendo calcaneus to middle of three facets on posterior aspect of calcaneus |
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| ACTION Plantar flexes foot. Flexes knee |
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| NERVE Tibial nerve (S1, 2) |