Quadriceps Femoris: Origin, Insertion, Action & Nerve Supply

Quadriceps Femoris:

The quadriceps femoris muscle consists of four individual muscles, three vastus muscles and a rectus femoris muscle. They form a main bulk of the thigh, and collectively they are one of the most powerful muscles in the body.

adductor of thigh muscles

 

Vastus Lateralis Muscle

Origin-Originates from the greater trochanter and the lateral lip of linea aspera.

Insertion-Lateral quadriceps tendon to patella, via ligamentum patellae into the tubercle of tibia

Function: Extends the knee joint and stabilizes the patella.

Nerve Supply: Femoral nerve

 

Vastus intermedius Muscle

Origin-Anterior and lateral aspects of the upper two-thirds of the femoral shaft and the lower part of the lateral intermuscular septum of the femur.
Insertion- Into the quadriceps tendon along with rectus femoris and the other vasti muscles, enveloping with the patella, then by the patellar ligament into the tibial tuberosity.
Function: Extends the knee joint and stabilizes the patella.

Nerve Supply: Femoral nerve.

 

Vastus Medialis Muscle

Origin-Originates from Inferior portion of intertrochanteric line, spiral line, medial lip of the linea aspera, superior part of the medial supracondylar ridge of the femur, and the medial intermuscular septum

Insertion-Medial base and border of the patella; also forms medial patellar retinaculum and medial side of the quadriceps femoris tendon
Function: Extends knee joint and stabilizes the patella.

Nerve Supply: Femoral nerve.

 

Rectus Femoris Muscle

Origin-originates from the ilium, just superior to the acetabulum. It runs straight down the leg

Insertion-attaches to the patella by the quadriceps femoris tendon.
Function: This is the only muscle that crosses both the hip and knee joints. It flexes hip joint and extends the knee joint.
Nerve Supply: Femoral nerve.