Pronunciation (BI-seps fe-MOR-us) Origin/Proximal Attachment Long Head: Ischial tuberosity Short Head: Lateral lip of linea aspera, proximal two thirds of supracondylar line & the lateral intermuscular septum Insertion/Distal Attachment Head of fibula & lateral tibial condyle Action/Relevance Flexes kneeExternally rotates hip (long head) Extends hip (long head) Innervation Long Head: Tibial nerve (L5, S1, 2) Short Head: Common Peroneal nerve (L5, S1) Notes Long head origin shared with semitendinosus The tendon splits into 3 parts main part goes around the lateral collateral lig middle part fuses with the lateral collateral deep fuses with the lateral condyle of the tibia | 
