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Biceps Femoris
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Biceps Femoris:
Proximal Attachment - Long head: ischial tuberosity
Short Head: Linea aspera and lateral supercondylar line of femur
Distal Attachment - Lateral side of head of fibula; tendon is split at this site by fibular collateral ligament of knee
Innervation - Long head: Tibial division of sciatic nerve
Short head: common fibular division of sciatic nerve
Action - Flexes leg and rotates it laterally when knee is flexed; extends thigh (e.g. accelerating mass during first step of gait)