Human leg the femur. All four muscles unite in a common tendon inserted into the patella from where the patellar ligament extends it down to the tibial tuberosity. Fibers from the medial and lateral vasti form two retinacula that stretch past the patella on either sides down to the condyles of the tibia. The quadriceps is "the" knee extensor, but the rectus femoris additionally flexes the hip joint, and articular muscle of the knee protects the articular capsule of the knee joint from being nipped during extension. The sartorius runs superficially and obliquely down on the anterior side of the thigh, from
Ultrasonography of chronic venous insufficiency of the legs 1/3 of the thigh. It can also but rarely, drain in the vein of the semimembranosus (thigh muscle) (shown below). Usually though, it connects with a perforator vein at its middle 1/3. To check for insufficiency, the Paraná maneuver is very useful. The Giacomini vein mostly acts as a bypass between the GSV and SSV territories. Usually its flow is in the normal anterograde direction, from bottom to top. However it can become retrograde without pathology. For example, after a GSV stripping, laser ablation or after its ligation at the sapheno-femoral junction, the Giacomini vein will drain into the SSV,