Quadriceps Femoris Group

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What are the four muscles of the quadriceps femoris group?

1. rectus femoris 2. Vastus intermedius 3. Vastus medialis 4. Vastus lateralis

Action of the quadriceps femoris group

All four muscles: Extend the knee Rectus femoris: Flex the hip (coxal joint)

Origin of Vastus Intermedius

Anterior and later shaft of femur

Origin of the Rectus Femoris

Anterior inferior iliac spine (AIIS)

Innervation of the Quadriceps Femoris Group

Femoral L2, 3, 4

Origin of Vastus Lateralis

Lateral lip of linea aspera, gluteal tuberosity and greater trochanter

Origin of the Vastus Medialis

Medial lip of linea aspera

What is the only quadriceps that crosses two joints--the hip and the knee?

rectus femoris


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