Pronunciation (gas-trok-NE-me-us) Origin/Proximal Attachment Medial Head: just above medial femoral condyle Lateral Head: just above lateral femoral condyle Insertion/Distal Attachment Calcaneus via calcaneal (‘Achilles’) tendon Action/Relevance Plantar-flexes ankle Flexes knee Stabilizes ankle & knee (when standing) Innervation Tibial nerve (S1, 2) Notes Connected to femur by two strong flat tendons Medial head is larger Muscle belly extends to mid calf with the belly of the medial head extending slightly lower than the lateral head. | 
