The newly described tensor vastus intermedius contributes to the extensor apparatus of the knee joint (Grob et al.; Rajasekaran & Hall 2016). It can be hypothesized that the tensor vastus intermedius as a fifth component of the quadriceps muscle group might represent a specific section in the in the quadriceps tendon. It has been shown, that the aponeurotic tendon fuses into the quadriceps tendon and inserts at the superior medial border of the patella (Grob et al.; Rajasekaran & Hall 2016). The purpose of the present study was to further investigate the multi-layered structure of the quadriceps tendon with special emphasis on on all components of the extensor apparatus.