Posteromedial corner of the knee. A, Superior or capsular arm of posterior oblique ligament (POL); AT, Adductor tubercle; B, central or tibial arm of posterior oblique ligament; C, superficial arm of posterior oblique ligament; G, gastrocnemius muscle; J, common ligament of origin of posterior oblique ligament; MCL, medial collateral ligament; ME, medial epicondyle; OP, oblique popliteal ligament; PA, pes anserinus; S, common tendon of semimembranosus; SP, portion of semimembranosus tendon that becomes oblique popliteal ligament; ST, portion of semimembranosus tendon that goes to posteromedial corner of tibia.