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
