Quadriceps
Quads · Thighs
- Origin
- Rectus femoris: anterior inferior iliac spine; vasti: femur
- Insertion
- Tibial tuberosity via the patellar tendon
- Action
- Extends the knee; the rectus femoris also flexes the hip
Four muscles on the front of the thigh (rectus femoris and three vasti). They straighten the knee in squats, lunges, leg presses and leg extensions.