The relationship between additional heads of the quadriceps femoris, the vasti muscles, and the patellar ligament

Figure 1

Scheme of type I quadriceps femoris. (a) Type IA quadriceps femoris: TVI: tensor vastus intermedius; SVL: superficial part of the vastus lateralis; IVL: intermediate part of the vastus lateralis; VI: vastus intermedius; VM: vastus medialis. (b) Type IB quadriceps femoris: TVI: tensor vastus intermedius; SVL: superficial part of the vastus lateralis; IVL: intermediate part of the vastus lateralis; VI: vastus intermedius; VM: vastus medialis.

(a)

(b)