Quadriceps group of muscles in human body

the quadriceps muscle is consist of four muscle

1. -rectus femoris

-vastus intermedius

-vastus medialis

-vastus lateralis

These four large anterior thigh muscles insert below the knee and act to extend the knee joint. the three vast lie deep to the rectus femoris and two have their origins on the posterior femur. the rectus femoris originates on the pelvis and thereby can act to flex the hip.

Quadriceps group of muscles in human body

1.rectus femoris

Origin-long head: anterior inferior iliac spine

short head: upper margin of the acetabulum

Insertion -patella and via patellar ligament to tibial tuberosity

Nerve supply-femoral nerve (l2,3,4)

Blood supply-lateral femoral circumflex artery

Action-Extention of knee

assist flexion of femur at hip

The palpation-anterior surface of the thigh during active knee extension

The Rectus femoris is the only muscle in the quadriceps group that crosses both the hip and knee joints. its combined action is seen as the leg is brought forward in walking.

Remaining three muscles of the quadriceps group

1.vastus medialis

2.vastus lateralis

3.vastus intermedius

*origin-

· Vastus medialis – linea aspera on posterior femur

· Vastus lateralis – linea aspera on the posterior femur, greater trochanter of femur

· Vastus intermedius – anterior and lateral femoral shaft

*insertion – patella and via patellar ligament to tibial tuberosity

*nerve supply – femoral nerve(l2,3,4)

*action- the extension of the knee

*palpation –

· Vastus medialis – anterior medial surface of the lower third of the thigh ,medial to biceps femoris during active knee extension

· Vastus lateralis – lateral surface of thigh, lateral to biceps femoris during active knee extension

· Vastus intermedius – may attempt to palpate under the rectus femoris by pushing this muscle medially during active knee extension. Vastus is the Latin term for immense .these three muscles of the quadriceps group derive their name from their size and position.

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